Full system update completed find earlier, but then attempting to install lightdm, the following error was received:

:: Proceed with installation? [Y/n] :: Retrieving packages... libxklavier-5.4-3-x86_64 72.5 KiB 145 KiB/s 00:01 [######################################] 100% lightdm-1:1.32.0-4-x86_64 239.1 KiB 357 KiB/s 00:01 [######################################] 100% Total (2/2) 311.6 KiB 351 KiB/s 00:01 [######################################] 100% (2/2) checking keys in keyring [######################################] 100% warning: Public keyring not found; have you run 'pacman-key --init'? downloading required keys... error: keyring is not writable error: keyring is not writable error: required key missing from keyring error: failed to commit transaction (unexpected error) Errors occurred, no packages were upgraded.

Huh?

Attempting to update archlinux-keyring results in:

:: Proceed with installation? [Y/n] (1/1) checking keys in keyring [######################################] 100% (1/1) checking package integrity [######################################] 100% error: archlinux-keyring: signature from "Christian Hesse eworm@archlinux.org" is unknown trust :: File /var/cache/pacman/pkg/archlinux-keyring-20221110-1-any.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.

Attempting lightdm again results in Allan's key not found and of unknown trust:

:: Proceed with installation? [Y/n] (2/2) checking keys in keyring [######################################] 100% downloading required keys... :: Import PGP key F99FFE0FEAE999BD, "Allan McRae allan@archlinux.org"? [Y/n] :: Import PGP key 0F65C7D881506130, "Maxime Gauduin alucryd@archlinux.org"? [Y/n] (2/2) checking package integrity [######################################] 100% error: libxklavier: signature from "Allan McRae (Developer) allan@archlinux.org" is unknown trust :: File /var/cache/pacman/pkg/libxklavier-5.4-3-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)). Do you want to delete it? [Y/n] error: lightdm: signature from "Maxime Gauduin alucryd@archlinux.org" is unknown trust :: File /var/cache/pacman/pkg/lightdm-1:1.32.0-4-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.

Is this a temporary issue or did something get fsck'ed up on my system? (and how to attempt to fix?)