# Arch Linux Packages

## Downgrade cached package

    pacman -U /var/cache/pacman/pkg/package-version...

## Cleaning cache

    paccache -r

* `-k`: how many past versions of each package to keep, defaults to 3.
* `-u`: target only uninstalled packages.

    # remove all versions of uninstalled packages
    paccache -ruk0

## Troubleshooting failed installations

Usually enough to update keyring:

    pacman -Sy archlinux-keyring

Might need to update mirrorlist first if outdated:

    sudo pacman -Sy pacman-mirrorlist

(this might put it in /etc/pacman.d/mirrorlist.pacnew, uncomment wanted mirrors
there and remove the .pacnew suffix)