I cannot load the shadow service [Solved]

systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
● shadow.service loaded failed failed Verify integrity of password and group files
I have searched the forum and google and have not been able to fix it.
Can you please help me?
Thank you.

The the journal for errors

journalctl --no-hostname --no-pager -u shadow.service
-- Logs begin at Sat 2020-03-28 19:15:09 CET, end at Sun 2020-11-15 10:42:12 CET. --
mar 29 11:10:19 systemd[1]: Started Verify integrity of password and group files.
mar 29 11:10:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
mar 30 00:00:12 systemd[1]: Started Verify integrity of password and group files.
mar 30 00:00:12 systemd[1]: shadow.service: Succeeded.
-- Reboot --
mar 31 00:00:06 systemd[1]: Started Verify integrity of password and group files.
mar 31 00:00:06 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 01 00:00:34 systemd[1]: Started Verify integrity of password and group files.
abr 01 00:00:34 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 02 00:00:01 systemd[1]: Started Verify integrity of password and group files.
abr 02 00:00:01 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 03 10:15:23 systemd[1]: Started Verify integrity of password and group files.
abr 03 10:15:23 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 04 12:22:47 systemd[1]: Started Verify integrity of password and group files.
abr 04 12:22:47 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 05 12:28:04 systemd[1]: Started Verify integrity of password and group files.
abr 05 12:28:04 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 06 10:48:51 systemd[1]: Started Verify integrity of password and group files.
abr 06 10:48:51 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 07 10:37:13 systemd[1]: Started Verify integrity of password and group files.
abr 07 10:37:13 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 09 11:28:57 systemd[1]: Started Verify integrity of password and group files.
abr 09 11:28:57 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 10 11:27:11 systemd[1]: Started Verify integrity of password and group files.
abr 10 11:27:11 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 11 16:07:40 systemd[1]: Started Verify integrity of password and group files.
abr 11 16:07:40 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 12 13:22:17 systemd[1]: Started Verify integrity of password and group files.
abr 12 13:22:17 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 13 11:44:40 systemd[1]: Started Verify integrity of password and group files.
abr 13 11:44:40 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 14 16:10:11 systemd[1]: Started Verify integrity of password and group files.
abr 14 16:10:11 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 15 12:37:35 systemd[1]: Started Verify integrity of password and group files.
abr 15 12:37:35 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 16 11:41:19 systemd[1]: Started Verify integrity of password and group files.
abr 16 11:41:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 17 13:41:48 systemd[1]: Started Verify integrity of password and group files.
abr 17 13:41:48 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 18 08:44:20 systemd[1]: Started Verify integrity of password and group files.
abr 18 08:44:20 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 19 11:17:30 systemd[1]: Started Verify integrity of password and group files.
abr 19 11:17:30 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 20 11:20:28 systemd[1]: Started Verify integrity of password and group files.
abr 20 11:20:28 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 21 09:58:58 systemd[1]: Started Verify integrity of password and group files.
abr 21 09:58:58 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 22 09:51:26 systemd[1]: Started Verify integrity of password and group files.
abr 22 09:51:26 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 23 11:35:59 systemd[1]: Started Verify integrity of password and group files.
abr 23 11:35:59 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 24 10:03:14 systemd[1]: Started Verify integrity of password and group files.
abr 24 10:03:14 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 25 12:42:34 systemd[1]: Started Verify integrity of password and group files.
abr 25 12:42:34 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 26 07:26:08 systemd[1]: Started Verify integrity of password and group files.
abr 26 07:26:08 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 27 10:28:32 systemd[1]: Started Verify integrity of password and group files.
abr 27 10:28:32 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 28 10:51:34 systemd[1]: Started Verify integrity of password and group files.
abr 28 10:51:34 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 29 11:48:56 systemd[1]: Started Verify integrity of password and group files.
abr 29 11:48:56 systemd[1]: shadow.service: Succeeded.
-- Reboot --
abr 30 10:29:40 systemd[1]: Started Verify integrity of password and group files.
abr 30 10:29:40 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 01 12:02:59 systemd[1]: Started Verify integrity of password and group files.
may 01 12:02:59 systemd[1]: shadow.service: Succeeded.
may 02 00:00:30 systemd[1]: Started Verify integrity of password and group files.
may 02 00:00:30 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 03 00:00:11 systemd[1]: Started Verify integrity of password and group files.
may 03 00:00:12 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 04 00:00:26 systemd[1]: Started Verify integrity of password and group files.
may 04 00:00:26 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 05 10:13:22 systemd[1]: Started Verify integrity of password and group files.
may 05 10:13:23 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 06 10:48:53 systemd[1]: Started Verify integrity of password and group files.
may 06 10:48:53 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 07 12:14:06 systemd[1]: Started Verify integrity of password and group files.
may 07 12:14:06 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 08 09:15:13 systemd[1]: Started Verify integrity of password and group files.
may 08 09:15:13 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 09 10:16:58 systemd[1]: Started Verify integrity of password and group files.
may 09 10:16:58 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 10 10:34:15 systemd[1]: Started Verify integrity of password and group files.
may 10 10:34:15 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 11 00:00:09 systemd[1]: Started Verify integrity of password and group files.
may 11 00:00:09 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 13 09:36:03 systemd[1]: Started Verify integrity of password and group files.
may 13 09:36:03 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 14 08:15:14 systemd[1]: Started Verify integrity of password and group files.
may 14 08:15:14 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 15 19:56:49 systemd[1]: Started Verify integrity of password and group files.
may 15 19:56:49 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 16 09:36:02 systemd[1]: Started Verify integrity of password and group files.
may 16 09:36:02 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 18 09:12:58 systemd[1]: Started Verify integrity of password and group files.
may 18 09:12:58 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 19 08:38:41 systemd[1]: Started Verify integrity of password and group files.
may 19 08:38:41 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 20 12:33:31 systemd[1]: Started Verify integrity of password and group files.
may 20 12:33:31 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 21 09:48:48 systemd[1]: Started Verify integrity of password and group files.
may 21 09:48:48 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 22 10:16:33 systemd[1]: Started Verify integrity of password and group files.
may 22 10:16:33 systemd[1]: shadow.service: Succeeded.
may 23 00:00:36 systemd[1]: Started Verify integrity of password and group files.
may 23 00:00:36 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 24 10:22:48 systemd[1]: Started Verify integrity of password and group files.
may 24 10:22:48 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 25 10:13:05 systemd[1]: Started Verify integrity of password and group files.
may 25 10:13:05 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 26 12:21:37 systemd[1]: Started Verify integrity of password and group files.
may 26 12:21:37 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 27 11:14:02 systemd[1]: Started Verify integrity of password and group files.
may 27 11:14:02 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 28 14:54:56 systemd[1]: Started Verify integrity of password and group files.
may 28 14:54:56 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 29 09:11:22 systemd[1]: Started Verify integrity of password and group files.
may 29 09:11:22 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 30 10:09:41 systemd[1]: Started Verify integrity of password and group files.
may 30 10:09:41 systemd[1]: shadow.service: Succeeded.
-- Reboot --
may 31 09:29:24 systemd[1]: Started Verify integrity of password and group files.
may 31 09:29:24 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 01 00:00:04 systemd[1]: Started Verify integrity of password and group files.
jun 01 00:00:04 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 02 10:37:53 systemd[1]: Started Verify integrity of password and group files.
jun 02 10:37:53 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 03 00:00:21 systemd[1]: Started Verify integrity of password and group files.
jun 03 00:00:21 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 04 09:40:56 systemd[1]: Started Verify integrity of password and group files.
jun 04 09:40:56 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 05 00:00:06 systemd[1]: Started Verify integrity of password and group files.
jun 05 00:00:06 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 06 11:39:23 systemd[1]: Started Verify integrity of password and group files.
jun 06 11:39:23 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 07 10:20:05 systemd[1]: Started Verify integrity of password and group files.
jun 07 10:20:05 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 08 06:45:17 systemd[1]: Started Verify integrity of password and group files.
jun 08 06:45:18 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 09 08:04:24 systemd[1]: Started Verify integrity of password and group files.
jun 09 08:04:24 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 10 10:47:20 systemd[1]: Started Verify integrity of password and group files.
jun 10 10:47:20 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 11 09:47:13 systemd[1]: Started Verify integrity of password and group files.
jun 11 09:47:13 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 12 10:01:02 systemd[1]: Started Verify integrity of password and group files.
jun 12 10:01:02 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 13 09:12:38 systemd[1]: Started Verify integrity of password and group files.
jun 13 09:12:38 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 14 13:10:42 systemd[1]: Started Verify integrity of password and group files.
jun 14 13:10:42 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 15 08:57:42 systemd[1]: Started Verify integrity of password and group files.
jun 15 08:57:42 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 16 20:06:59 systemd[1]: Started Verify integrity of password and group files.
jun 16 20:06:59 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 17 08:42:39 systemd[1]: Started Verify integrity of password and group files.
jun 17 08:42:39 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 18 09:04:46 systemd[1]: Started Verify integrity of password and group files.
jun 18 09:04:46 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 19 11:06:56 systemd[1]: Started Verify integrity of password and group files.
jun 19 11:06:56 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 20 09:18:45 systemd[1]: Started Verify integrity of password and group files.
jun 20 09:18:45 systemd[1]: shadow.service: Succeeded.
jun 21 00:00:19 systemd[1]: Started Verify integrity of password and group files.
jun 21 00:00:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 22 00:00:25 systemd[1]: Started Verify integrity of password and group files.
jun 22 00:00:25 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 23 08:20:12 systemd[1]: Started Verify integrity of password and group files.
jun 23 08:20:12 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 24 10:52:27 systemd[1]: Started Verify integrity of password and group files.
jun 24 10:52:27 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 25 10:05:22 systemd[1]: Started Verify integrity of password and group files.
jun 25 10:05:22 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 26 13:10:49 systemd[1]: Started Verify integrity of password and group files.
jun 26 13:10:49 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 27 00:01:01 systemd[1]: Started Verify integrity of password and group files.
jun 27 00:01:01 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 28 10:37:30 systemd[1]: Started Verify integrity of password and group files.
jun 28 10:37:30 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 29 18:01:47 systemd[1]: Started Verify integrity of password and group files.
jun 29 18:01:47 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jun 30 10:15:11 systemd[1]: Started Verify integrity of password and group files.
jun 30 10:15:11 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 01 10:03:52 systemd[1]: Started Verify integrity of password and group files.
jul 01 10:03:52 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 02 08:01:51 systemd[1]: Started Verify integrity of password and group files.
jul 02 08:01:51 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 03 09:30:06 systemd[1]: Started Verify integrity of password and group files.
jul 03 09:30:06 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 04 10:11:58 systemd[1]: Started Verify integrity of password and group files.
jul 04 10:11:58 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 05 11:06:14 systemd[1]: Started Verify integrity of password and group files.
jul 05 11:06:14 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 06 11:54:15 systemd[1]: Started Verify integrity of password and group files.
jul 06 11:54:15 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 07 11:49:32 systemd[1]: Started Verify integrity of password and group files.
jul 07 11:49:32 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 08 13:00:33 systemd[1]: Started Verify integrity of password and group files.
jul 08 13:00:33 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 09 15:15:10 systemd[1]: Started Verify integrity of password and group files.
jul 09 15:15:10 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 10 10:14:40 systemd[1]: Started Verify integrity of password and group files.
jul 10 10:14:40 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 11 15:41:40 systemd[1]: Started Verify integrity of password and group files.
jul 11 15:41:40 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 12 10:55:59 systemd[1]: Started Verify integrity of password and group files.
jul 12 10:55:59 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 13 09:45:12 systemd[1]: Started Verify integrity of password and group files.
jul 13 09:45:12 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 14 11:34:45 systemd[1]: Started Verify integrity of password and group files.
jul 14 11:34:45 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 15 11:26:09 systemd[1]: Started Verify integrity of password and group files.
jul 15 11:26:09 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 16 13:59:53 systemd[1]: Started Verify integrity of password and group files.
jul 16 13:59:53 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 17 10:55:47 systemd[1]: Started Verify integrity of password and group files.
jul 17 10:55:47 systemd[1]: shadow.service: Succeeded.
jul 18 00:00:00 systemd[1]: Started Verify integrity of password and group files.
jul 18 00:00:00 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 19 00:00:08 systemd[1]: Started Verify integrity of password and group files.
jul 19 00:00:08 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 20 10:28:07 systemd[1]: Started Verify integrity of password and group files.
jul 20 10:28:07 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 21 14:04:51 systemd[1]: Started Verify integrity of password and group files.
jul 21 14:04:51 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 22 09:52:38 systemd[1]: Started Verify integrity of password and group files.
jul 22 09:52:38 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 23 00:00:01 systemd[1]: Started Verify integrity of password and group files.
jul 23 00:00:01 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 24 10:07:19 systemd[1]: Started Verify integrity of password and group files.
jul 24 10:07:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 25 10:14:41 systemd[1]: Started Verify integrity of password and group files.
jul 25 10:14:41 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 26 10:22:05 systemd[1]: Started Verify integrity of password and group files.
jul 26 10:22:05 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 27 13:07:17 systemd[1]: Started Verify integrity of password and group files.
jul 27 13:07:17 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 28 10:14:16 systemd[1]: Started Verify integrity of password and group files.
jul 28 10:14:16 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 29 09:44:51 systemd[1]: Started Verify integrity of password and group files.
jul 29 09:44:51 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 30 09:56:06 systemd[1]: Started Verify integrity of password and group files.
jul 30 09:56:06 systemd[1]: shadow.service: Succeeded.
-- Reboot --
jul 31 23:53:22 systemd[1]: Started Verify integrity of password and group files.
jul 31 23:53:22 systemd[1]: shadow.service: Succeeded.
ago 01 00:00:05 systemd[1]: Started Verify integrity of password and group files.
ago 01 00:00:05 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 02 09:51:08 systemd[1]: Started Verify integrity of password and group files.
ago 02 09:51:08 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 03 12:16:41 systemd[1]: Started Verify integrity of password and group files.
ago 03 12:16:41 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 04 10:24:55 systemd[1]: Started Verify integrity of password and group files.
ago 04 10:24:55 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 05 00:00:24 systemd[1]: Started Verify integrity of password and group files.
ago 05 00:00:24 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 06 09:31:37 systemd[1]: Started Verify integrity of password and group files.
ago 06 09:31:37 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 07 08:26:33 systemd[1]: Started Verify integrity of password and group files.
ago 07 08:26:33 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 08 10:37:49 systemd[1]: Started Verify integrity of password and group files.
ago 08 10:37:49 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 09 13:29:21 systemd[1]: Started Verify integrity of password and group files.
ago 09 13:29:21 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 10 13:02:28 systemd[1]: Started Verify integrity of password and group files.
ago 10 13:02:28 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 11 08:22:57 systemd[1]: Started Verify integrity of password and group files.
ago 11 08:22:57 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 12 11:46:18 systemd[1]: Started Verify integrity of password and group files.
ago 12 11:46:18 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 13 08:53:47 systemd[1]: Started Verify integrity of password and group files.
ago 13 08:53:47 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 16 09:42:28 systemd[1]: Started Verify integrity of password and group files.
ago 16 09:42:28 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 17 09:43:31 systemd[1]: Started Verify integrity of password and group files.
ago 17 09:43:31 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 21 20:26:19 systemd[1]: Started Verify integrity of password and group files.
ago 21 20:26:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 22 09:31:15 systemd[1]: Started Verify integrity of password and group files.
ago 22 09:31:15 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 23 09:45:17 systemd[1]: Started Verify integrity of password and group files.
ago 23 09:45:17 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 26 20:04:14 systemd[1]: Started Verify integrity of password and group files.
ago 26 20:04:14 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 28 14:06:25 systemd[1]: Started Verify integrity of password and group files.
ago 28 14:06:25 systemd[1]: shadow.service: Succeeded.
-- Reboot --
ago 29 03:18:19 systemd[1]: Started Verify integrity of password and group files.
ago 29 03:18:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 01 20:56:32 systemd[1]: Started Verify integrity of password and group files.
sep 01 20:56:32 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 03 12:12:17 systemd[1]: Started Verify integrity of password and group files.
sep 03 12:12:17 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 04 13:59:39 systemd[1]: Started Verify integrity of password and group files.
sep 04 13:59:39 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 09 10:12:28 systemd[1]: Started Verify integrity of password and group files.
sep 09 10:12:28 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 10 11:52:31 systemd[1]: Started Verify integrity of password and group files.
sep 10 11:52:31 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 11 18:28:25 systemd[1]: Started Verify integrity of password and group files.
sep 11 18:28:25 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 12 17:07:46 systemd[1]: Started Verify integrity of password and group files.
sep 12 17:07:46 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 14 05:42:37 systemd[1]: Started Verify integrity of password and group files.
sep 14 05:42:37 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 15 12:00:06 systemd[1]: Started Verify integrity of password and group files.
sep 15 12:00:06 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 16 08:47:55 systemd[1]: Started Verify integrity of password and group files.
sep 16 08:47:55 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 17 15:41:32 systemd[1]: Started Verify integrity of password and group files.
sep 17 15:41:32 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 18 19:40:41 systemd[1]: Started Verify integrity of password and group files.
sep 18 19:40:41 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 21 09:28:44 systemd[1]: Started Verify integrity of password and group files.
sep 21 09:28:44 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 22 14:13:50 systemd[1]: Started Verify integrity of password and group files.
sep 22 14:13:50 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 23 17:50:59 systemd[1]: Started Verify integrity of password and group files.
sep 23 17:50:59 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 24 20:00:04 systemd[1]: Started Verify integrity of password and group files.
sep 24 20:00:04 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 27 10:01:24 systemd[1]: Started Verify integrity of password and group files.
sep 27 10:01:24 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 28 00:55:09 systemd[1]: Started Verify integrity of password and group files.
sep 28 00:55:09 systemd[1]: shadow.service: Succeeded.
sep 28 00:00:10 systemd[1]: Started Verify integrity of password and group files.
sep 28 00:00:10 systemd[1]: shadow.service: Succeeded.
-- Reboot --
sep 30 19:12:30 systemd[1]: Started Verify integrity of password and group files.
sep 30 19:12:30 systemd[1]: shadow.service: Succeeded.
oct 01 00:00:01 systemd[1]: Started Verify integrity of password and group files.
oct 01 00:00:01 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 03 08:05:38 systemd[1]: Started Verify integrity of password and group files.
oct 03 08:05:38 systemd[1]: shadow.service: Succeeded.
oct 04 00:00:19 systemd[1]: Started Verify integrity of password and group files.
oct 04 00:00:19 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 05 00:00:09 systemd[1]: Started Verify integrity of password and group files.
oct 05 00:00:09 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 06 21:56:31 systemd[1]: Started Verify integrity of password and group files.
oct 06 21:56:31 systemd[1]: shadow.service: Succeeded.
oct 07 00:00:00 systemd[1]: Started Verify integrity of password and group files.
oct 07 00:00:00 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 09 08:13:14 systemd[1]: Started Verify integrity of password and group files.
oct 09 08:13:14 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 10 07:24:07 systemd[1]: Started Verify integrity of password and group files.
oct 10 07:24:07 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 11 21:17:50 systemd[1]: Started Verify integrity of password and group files.
oct 11 21:17:50 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 13 22:07:47 systemd[1]: Started Verify integrity of password and group files.
oct 13 22:07:47 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 15 09:14:16 systemd[1]: Started Verify integrity of password and group files.
oct 15 09:14:16 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 16 11:16:11 systemd[1]: Started Verify integrity of password and group files.
oct 16 11:16:11 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 21 08:48:28 systemd[1]: Started Verify integrity of password and group files.
oct 21 08:48:28 systemd[1]: shadow.service: Succeeded.
-- Reboot --
oct 22 11:08:00 systemd[1]: Started Verify integrity of password and group files.
oct 22 11:08:00 sh[1087]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
oct 22 11:08:00 sh[1087]: pwck: sin cambios
oct 22 11:08:00 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
oct 22 11:08:00 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
oct 27 12:50:54 systemd[1]: Started Verify integrity of password and group files.
oct 27 12:50:54 sh[1101]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
oct 27 12:50:54 sh[1101]: pwck: sin cambios
oct 27 12:50:54 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
oct 27 12:50:54 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
oct 28 11:54:27 systemd[1]: Started Verify integrity of password and group files.
oct 28 11:54:27 sh[1104]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
oct 28 11:54:27 sh[1104]: pwck: sin cambios
oct 28 11:54:27 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
oct 28 11:54:27 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
oct 30 17:39:54 systemd[1]: Started Verify integrity of password and group files.
oct 30 17:39:54 sh[1121]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
oct 30 17:39:54 sh[1121]: pwck: sin cambios
oct 30 17:39:54 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
oct 30 17:39:54 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 02 12:57:16 systemd[1]: Started Verify integrity of password and group files.
nov 02 12:57:16 sh[1111]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 02 12:57:16 sh[1111]: pwck: sin cambios
nov 02 12:57:16 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 02 12:57:16 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 03 10:25:03 systemd[1]: Started Verify integrity of password and group files.
nov 03 10:25:03 sh[1110]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 03 10:25:03 sh[1110]: pwck: sin cambios
nov 03 10:25:03 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 03 10:25:03 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 04 18:36:47 systemd[1]: Started Verify integrity of password and group files.
nov 04 18:36:47 sh[1152]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 04 18:36:47 sh[1152]: pwck: sin cambios
nov 04 18:36:47 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 04 18:36:47 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 05 17:05:45 systemd[1]: Started Verify integrity of password and group files.
nov 05 17:05:45 sh[1146]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 05 17:05:45 sh[1146]: pwck: sin cambios
nov 05 17:05:45 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 05 17:05:45 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 06 08:14:43 systemd[1]: Started Verify integrity of password and group files.
nov 06 08:14:43 sh[1110]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 06 08:14:43 sh[1110]: pwck: sin cambios
nov 06 08:14:43 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 06 08:14:43 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 07 08:21:18 systemd[1]: Started Verify integrity of password and group files.
nov 07 08:21:18 sh[1119]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 07 08:21:18 sh[1119]: pwck: sin cambios
nov 07 08:21:18 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 07 08:21:18 systemd[1]: shadow.service: Failed with result 'exit-code'.
nov 08 00:00:48 systemd[1]: Started Verify integrity of password and group files.
nov 08 00:00:48 sh[547534]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 08 00:00:48 sh[547534]: pwck: sin cambios
nov 08 00:00:48 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 08 00:00:48 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 09 08:42:35 systemd[1]: Started Verify integrity of password and group files.
nov 09 08:42:35 sh[1113]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 09 08:42:35 sh[1113]: pwck: sin cambios
nov 09 08:42:35 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 09 08:42:35 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 10 08:45:05 systemd[1]: Started Verify integrity of password and group files.
nov 10 08:45:05 sh[1142]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 10 08:45:05 sh[1142]: pwck: sin cambios
nov 10 08:45:05 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 10 08:45:05 systemd[1]: shadow.service: Failed with result 'exit-code'.
nov 10 08:50:45 systemd[1]: Started Verify integrity of password and group files.
nov 10 08:50:45 sh[51485]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 10 08:50:45 sh[51485]: pwck: sin cambios
nov 10 08:50:45 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 10 08:50:45 systemd[1]: shadow.service: Failed with result 'exit-code'.
nov 10 08:52:36 systemd[1]: Started Verify integrity of password and group files.
nov 10 08:52:36 sh[65355]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 10 08:52:36 sh[65355]: pwck: sin cambios
nov 10 08:52:36 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 10 08:52:36 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 11 18:23:35 systemd[1]: Started Verify integrity of password and group files.
nov 11 18:23:35 sh[1133]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 11 18:23:35 sh[1133]: pwck: sin cambios
nov 11 18:23:35 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 11 18:23:35 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 12 07:43:00 systemd[1]: Started Verify integrity of password and group files.
nov 12 07:43:00 sh[1130]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 12 07:43:00 sh[1130]: pwck: sin cambios
nov 12 07:43:00 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 12 07:43:00 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 13 11:01:01 systemd[1]: Started Verify integrity of password and group files.
nov 13 11:01:01 sh[1116]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 13 11:01:01 sh[1116]: pwck: sin cambios
nov 13 11:01:01 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 13 11:01:01 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 13 11:51:18 systemd[1]: Started Verify integrity of password and group files.
nov 13 11:51:18 sh[129603]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 13 11:51:18 sh[129603]: pwck: sin cambios
nov 13 11:51:18 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 13 11:51:18 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 14 13:53:57 systemd[1]: Started Verify integrity of password and group files.
nov 14 13:53:57 sh[1122]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 14 13:53:57 sh[1122]: pwck: sin cambios
nov 14 13:53:57 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 14 13:53:57 systemd[1]: shadow.service: Failed with result 'exit-code'.
-- Reboot --
nov 15 09:51:58 systemd[1]: Started Verify integrity of password and group files.
nov 15 09:51:58 sh[1118]: usuario «gdm»: el directorio «/var/lib/gdm» no existe
nov 15 09:51:58 sh[1118]: pwck: sin cambios
nov 15 09:51:58 systemd[1]: shadow.service: Main process exited, code=exited, status=1/FAILURE
nov 15 09:51:58 systemd[1]: shadow.service: Failed with result 'exit-code'.

Fix this error and the shadow service will not complain anymore. You can either create the folder /var/lib/gdm or remove the gdm user if you don’t use GDM anymore.

Not sure about this one. Fix the gdm user problem first, and then start

systemctl start shadow.service

to see if there are new errors

The gdm folder did not exist, I created it and then started the service without any problem.
Thank you very much for your help xabbu.

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