Ok, so last attempt was to install Test version. But it failed to install (unknown component).
So I got back to update system from terminal. And after
sudo apt --fix-broken install
i got:
dpkg: warning: ‘ldconfig’ not found in PATH or not executable
dpkg: error: 1 expected program not found in PATH or not executable
Note: root’s PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin
Apparently ldconfig is missing so I think best solution is to backup config and fresh install. Am I wrong?