FAQ

sudo apt update returns command not found, what should I do?

ArchLinux does not use apt to manage packages but pacman, to update all of your packages use sudo pacman -Syu

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I tried to update my packges but I see some error about GPG keys

It may happen on ArchLinux from time to time, in this case run first sudo pacman -S archlinux-keyring and then sudo pacman -Syu