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Errors

Systemd failed units

systemctl --failed --all

Error logs

journalctl -p 3 -xb

Update the system

Update the keys. Needed if the last update was a long time ago.

sudo pacman-key --refresh-keys

Update

yay --editmenu -Syyu --devel --timeupdate

Clean

yay -Yc # Clean unneeded dependencies
yay -Sc # Remove all the cached packages that are not currently installed
paccache -rk1 # Removes up to one version of all packages
paccache -ruk0 # Remove all cached versions of uninstalled packages

Update config files.

pacdiff
DIFFPROG=meld pacdiff

More info on how to use vimdiff https://yurialek.gitlab.io/guides/linux/vim.html#vimdiff. meld is a GUI utility.

Signature from "" is unknown trust.

Or signature from "" is marginal trust. Happens when the system has not been updated in a long time. Archwiki - Pacman - Package signing

Update Arch's keyring and gnupg. This populates the new keys automatically.

sudo pacman -S archlinux-keyring gnupg

You can force a full reload of all the signatures.

rm -r /etc/pacman.d/gnupg
pacman-key --init
pacman-key --populate archlinux
pacman-key --refresh-keys

Update mirrorlist.

Takes around 10 minutes.

sudo mv /etc/pacman.d/mirrorlist /etc/pacman.d/mirrorlist.$(date +'%Y.%m.%d').old
curl -o /tmp/mirrorlist.new https://archlinux.org/mirrorlist/all/
sed -i 's/^#Server/Server/' /tmp/mirrorlist.new
rankmirrors -n 10 /tmp/mirrorlist.new | sudo tee /etc/pacman.d/mirrorlist

find / -xtype l -print