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Many articles will point to the issue being caused by not updating for a while; I update daily if not weekly and this has happened to me twice even with recently updating a day or two previously. My system is Manjaro KDE. The solution I have come up with is pulled together from many forum posts and lots of testing to figure out what worked.

Below are examples of the error messages I saw while running sudo pacman -Syuu:

error: libadwaita: key "06687A1D9D4FAB08B50FD92B3B94A80E50A477C7" is unknown
:: Import PGP key 06687A1D9D4FAB08B50FD92B3B94A80E50A477C7? [Y/n]
:: File /var/cache/pacman/pkg/libadwaita-1:1.3.3-1-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]
...
...
error: failed to commit transaction (invalid or corrupted package (PGP signature))
Errors occurred, no packages were upgraded.


While trying different fixes I had some of the below steps missing and was getting errors like the following, but once I did everything in order they cleared up:

==> ERROR: Trust database could not be updated.
error: command failed to execute correctly

1. Terminal: kate /etc/pacman.conf
2. Edit line 45, which should read SigLevel = Required DatabaseOptional to instead read SigLevel = Optional TrustAll
3. Save
4. Terminal: sudo rm -rf /etc/pacman.d/gnupg/*
5. Terminal: sudo pacman-key --init
6. Terminal: sudo pacman-key --populate
7. Terminal: sudo pacman -Sy archlinux-keyrin
8. Terminal: sudo pacman -Syyu
9. Reboot
10. Change Line 45 of /etc/pacman.conf back to the default value (shown in Step 2)

NOTE: I tried a lot of different things before coming up with these exact steps. There is always a chance that something I did in the middle, which isn’t listed in the above steps was also part of the resolution and was omitted think it just “didn’t work.” If I run into this problem again in the future I will update this if I find anything else is needed.

This allowed me to update an individual package as well as an entire OS update.