Kernel update failed + new kernel is not installing

I installed the latest version of manjaro kde (dual boot with windows 10). I used the same FAT32 partition for manjaro, which was only 100 Mb. Manjaro installer warned me that the EFI partition should be at least 300 Mb. But I ignored it.
After installing, I run the update manager. But updates got failed.
The output is-

Checking keyring...
Checking integrity...
Error: linux515: signature from "Manjaro Build Server <build@manjaro.org>" is unknown trust
Removing invalid files and retrying...
Resolving dependencies...
Checking inter-conflicts...
Download of linux515 (5.15.78-1) started
Download of linux515 (5.15.78-1) finished
Checking keyring...
Checking integrity...
Error: linux515: signature from "Manjaro Build Server <build@manjaro.org>" is unknown trust
Failed to commit transaction:
invalid or corrupted package:

Then I tried to install a new karnel. It also failed.
The output was-

Checking keyring...
Checking integrity...
Error: linux515: signature from "Manjaro Build Server <build@manjaro.org>" is unknown trust
Removing invalid files and retrying...
Resolving dependencies...
Checking inter-conflicts...
Download of linux515 (5.15.78-1) started
Download of linux515 (5.15.78-1) finished
Checking keyring...
Checking integrity...
Error: linux515: signature from "Manjaro Build Server <build@manjaro.org>" is unknown trust
Failed to commit transaction:
invalid or corrupted package:

(Mirror-Global)

  1. How can I fix it?
  2. Is 100 Mb EFI partition enough for Manjaro KDE and Windows 10?

Moderator edit: In the future, please use proper formatting: [HowTo] Post command output and file content as formatted text

Update the mirrors and your local keyring first: [HowTo] Work around gpg verification issue on left behind systems

Your problem has nothing to do with partition sizes.

Also, it’s kernel.

1 Like

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Many, many thanks.
It works.

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