I'm getting an 'invalid or corrupted package (PGP signature)' error which is preventing updates

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You’ll find an answer how to fix here:

[FAQ] Issues with “signature is marginal trust”, "signature is unknown trust", or “invalid or corrupted package”

If you’re getting an error similar to “Can’t update: signature from *** is marginal trust” or “invalid or corrupted package” you probably just need to update your package signing keys: sudo pacman -Sy archlinux-keyring endeavouros-keyring sudo pacman -Syu Also make sure your system clock is correct! Of course, it’s also possible that the package file actually is corrupt. Remove it from /var/cache/pacman/pkg/ so pacman will download it again. If no package file is explicitly mentioned then yo…

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@Isaac

but I’d want to know what’s gone wrong first, if possible.

@jonathon could probably give you more information on why, but basically it’s package signature mismatch (for whatever reason be it mistake of developer or just key expiration date is out), sometimes it’s keyserver problem…

Those problems are usually very rare, i had it maybe 1 time in 2 years