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Reference:wiki.archlinux.org

Downgrade package ​

Arch Wiki reference

Check the latest updates in /var/log/pacman.log. To downgrade a package, run (example of svt-av1):

shell
sudo pacman -U file:///var/cache/pacman/pkg/svt-av1-2.2.1-1-x86_64.pkg.tar.zst

Then to prevent upgrade of that package, edit /etc/pacman.conf:

txt
IgnorePkg = svt-av1

System cleanup ​

Every week, delete all cached versions of installed and uninstalled packages, except for the most recent three:

shell
sudo systemctl start/enable paccache.timer

Remove packages that are no longer installed from the cache as well as currently unused sync databases to free up disk space. Use one --clean switch to only remove packages that are no longer installed. Use two to remove all files from the cache.

shell
sudo pacman -Sc

Missing .so file ​

Search for package that installs a missing .so file:

shell
pkgfile -s libcrypt.so.1