I seem to have lost the
lock screen option for one user of the system. It does not appear in the menu in the top right hand corner (with
Log Out etc) and nor does
Ctrl+Alt+L do anything despite being listed in the keyboard shortcuts of my system settings to lock screen. If I go to
Brightness and Lock the lock area is just greyed out.
This facility is available to other users on the system so I'm not quite sure what the problem is. I should note that this particular user is not an admin user and does not have
sudo privileges whereas the user is works for does (just in case that is important).
I can't remember if I perhaps turned this facility off a long time ago for this user, but if so now I don't seem to be able to get it back.
Some things I've tried:
Removed xscreensaver, re-installed gnome-screensaver (currently the newest version)
gsettings set org.gnome.desktop.screensaver lock-enabled true
I created a new test user with no admin privileges and for them the
lock screenoption was available.