Solution to access my encrypted Manjaro

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1

I have encrypted manjaro installed.
as the screen brightness was not working i went across manjaro solutions to make it work. But instead i messed up /etc/default/grub file. Mainly the GRUB_CMDLINE_LINUX_DEFAULT line was edited and it contained some UUID which was mistakenly removed. After that I ran “sudo reboot”.

I tried to recover with the snapshots but couldn’t recover it.

Now I’m not able to access manjaro OS. Getting error as shown in the below.

mount: /openswap_keymount: no filesystem type specified
Failed to open key file.
unmount: can't unmount openswap_keymount: Invalid argument
ERROR: resume: no device specified for hibernation
mount: /new_root: can't find UUID=<uuid>
You are now being dropped into an emergency shell.
sh: can't access tty; job control turned off
[rootfs ]#

I have tried decrypting it and mounting with the usb thumb drive.
followed the steps mentioned in the below links.

I tried to decrypt it using

sudo fdisk -l
sudo cryptsetup luksOpen /dev/nvme0n1p3 encrypted_device
sudo vgchange -ay

After decrypting, Mounting it back again.
mount -o subvol=@ /dev/mapper/encrypted_device /mnt

updating the grub again.

grub-mkconfig config
grub-mkconfig -o /boot/grub/grub.cfg

It was not successful.
Is there any other way to restore manjaro or restore /etc/default/grub.

Referred links:

https://techblog.jeppson.org/2020/03/chroot-into-encrypted-drive/

https://wiki.manjaro.org/index.php/GRUB/Restore_the_GRUB_Bootloader
2

But did you added back the deleted entries that are required in the grub file?

3

I’m not able to add the deleted(GRUB_CMDLINE_LINUX_DEFAULT) as i’m not able to access the OS.
I had saved the GRUB_CMDLINE_LINUX_DEFAULT=’ ’ in a notepad which i’m not able to access.

4

You booted up from Live environment, to chroot your installed system. Did you manage to decrypt it and chroot in it?

5

You mount the decrypted partition, inside the encrypted container, on /mnt, but you generate a new /boot/grub/grub.cfg which is not inside the /mnt :wink:

Plus you won’t get any different outcome unless you change the /etc/default/grub INSIDE /mnt and chroot into /mnt before you give the command to regenerate your grub config…

Thus you need to in sequence:

  1. Open the encrypted container
  2. Mount the @ subvolume inside the container at /mnt
  3. chroot into /mnt
  4. Change /etc/default/grub from within the chroot.
  5. Regenerate your grub config from inside the chroot.
  • It would help to post your fstab from inside the encrypted container, which might still have the UUID’s you need.

I suppose you saved that file inside your HOME dir?
In that case you probably can mount that also, it should be the @home subvolume instead of the @ one… :wink:

systemd-mount -o subvol=@home /dev/mapper/encrypted_device /mnt/home
1 Like
6

yes I booted up the manjaro OS(did not re-install) using bootable USB and then later decrypted the logical volume(/dev/nvme0n1p2) and mounted it.
after mounting, wat is the next step?

after mounting I just shutdown and restarted the laptop to see if I can access manjaro OS but was not successful.

7

Thank you. I could manage to recover the GRUB_CMDLINE_LINUX_DEFAULT= ’ ’ which i had saved in the notepad. As you had mentioned to access the files from the @home directory.

But now i want to paste the GRUB_CMDLINE_LINUX_DEFAULT= ’ ’ back into /etc/default/grub of the encrypted volume. is there a way to access that file?

8

I managed to recover the command and paste it back in the /etc/default/grub and later updated the grub via chroot and restarted the system voila i was able to get back the OS.

Thank you for the assistance.

9

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