SHELL

error: required key missing from keyring

#Run following commands

sudo pacman -Scc
sudo pacman -Syy
sudo pacman -S archlinux-keyring
sudo pacman-key --init
sudo pacman-key --populate archlinux
sudo pacman -Syu
#if it not work then
First, install the primary key - it can then be used to install our keyring and mirrorlist.
$ sudo pacman-key --recv-key FBA220DFC880C036 --keyserver keyserver.ubuntu.com
$ sudo pacman-key --lsign-key FBA220DFC880C036
$ sudo pacman -U 'https://cdn-mirror.chaotic.cx/chaotic-aur/chaotic-keyring.pkg.tar.zst' 'https://cdn-mirror.chaotic.cx/chaotic-aur/chaotic-mirrorlist.pkg.tar.zst'
Append (adding to the end of the file) to /etc/pacman.conf:
[chaotic-aur]
Include = /etc/pacman.d/chaotic-mirrorlist