Pacman Recovery

Due to issues with pacman updates and the system freezing, logging out etc. it has become necessary to recover from this more than once.

The critical stages are

sudo rm /var/lib/pacman/db.lck

Then find what is not complete

LC_ALL=C pacman -Qkk 2>&1 | grep -v ', 0 altered files' | grep mtree

Then reinstall packages returned from the above with

sudo pacman -Syu <package> --overwrite '*'

The last command may prompt removal of an incorrect package in the cache, so delete it and run it again to download a new complete package.

After all the errors are gone you can move on and hope this is fixed soon.