Fixes pacman GPG problems (e.g: "no pulic key") by rebuilding /etc/pacman.d/gnupg

pacman-nuclear-gpg-fix.sh

#!/bin/sh

## Sometimes pacman enters a corrupted state where it cannot
## download any packages due to no public key being present
## to self-sign the archlinux certificates.
##
## This script fixes and reconstructs /etc/.pacman.d/gnugp
## Tested exclusively on Arco Linux; the results may be
## unpredictable on a non-Arco/Arch distro, e.g. 
## Endeavor, Manjaro, etc..
##
## On Arco you're fine though. 

echo "You should be running this script as root."
sudo echo "Fixing..."

sudo rm -r /etc/pacman.d/gnupg
sudo pacman-key --init
sudo pacman-key --populate archlinux
sudo pacman-key -S archlinux-keyring
sudo pacman -S archlinux-keyring
sudo pacman -Sy

echo "THIS IS ENTIRELY OPTIONAL"
echo "If you want Pacman even fresher, you can clear your cache and unused repositories."
echo "Feel free to say no; this is not crucial, but it may help."
sudo pacman -Scc

echo "Running pacman-key --refresh-keys may take a little while."
echo "Have patience, don't interrupt the process." 
sudo pacman-key --refresh-keys