This (not locking when pressing Ctrl+Alt+L) still happens with a clean install of Ubuntu 15.04 and the same workaround (adding gnome-screensaver to the autostart programs) resolves the issue.
This (not locking when pressing Ctrl+Alt+L) still happens with a clean install of Ubuntu 15.04 and the same workaround (adding gnome-screensaver to the autostart programs) resolves the issue.