To uninstall mate-screensaver-dbg just follow these instructions.
sudo apt-get remove mate-screensaver-dbg
This will remove just the mate-screensaver-dbg package itself.
sudo apt-get remove --auto-remove mate-screensaver-dbg
This will remove the mate-screensaver-dbg package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for mate-screensaver-dbg then this will work.
sudo apt-get purge mate-screensaver-dbg
Or similarly, like this mate-screensaver-dbg
sudo apt-get purge --auto-remove mate-screensaver-dbg
|Maintainer||MATE Packaging Team <email@example.com>|
|Description||MATE screen saver and locker (debugging symbols)|