BTW I have that ugly situation directly after flashing my internal pbpro mmc with the latest and greatest Gnome image version!
Update @lectrode:
command: pacman -S firefox
result:`resolving dependencies…
looking for conflicting packages…
Packages (2) mailcap-2.1.53-1 firefox-108.0.1-1
Total Installed Size: 204,69 MiB
:: Proceed with installation? [Y/n] Y
(2/2) checking keys in keyring [######################] 100%
(2/2) checking package integrity [######################] 100%
error: mailcap: signature from “Arch Linux ARM Build System builder@archlinuxarm.org” is unknown trust
:: File /var/cache/pacman/pkg/mailcap-2.1.53-1-any.pkg.tar.xz 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.
`
Version of image is #…gnome-pbpro-22.12…"
Update of update!
You won’t believe but it’s true: only minutes after writing the above update I - just for fun - tested updating /installing via pamac, and guess what: suddenly everything worked fine as if no problem existed before. Complete update with 145 packages, restart and installing new/additional packages.
I really confirm I did not change or do anything else! I simply do not understand what is happening here.