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Linux: Minor Annoyances and How To Fix Them
A work in progress.
Arch: Invalid or corrupted database (PGP signature)
First, change the SigLevel in pacman.conf:
# SigLevel = Required DatabaseOptional SigLevel = Optional TrustAll
If that doesn't fix it, try clearing your pacman cache:
sudo pacman -Sc
And try again. If you still get the error, you probably have a package that is actually corrupted. This is very rare in the main repos. If it is from the AUR, contact the package mantainer.