It was working and one day it decided not to work anymore. I can click on the lock screen button or use Ctrl+Alt+Del but no reaction. How to fix that?
I am using Xubuntu 14.04
Ubuntu – Xubuntu doesn’t lock screen anymore
lock-screenxubuntu
Related Solutions
In the top panel right corner choose System Settings to select Keyboard in the Hardware section, or type "key.." in the Dash then select Keyboard:
In the Shortcuts tab all key combinations are listed. You may change them there or add your own custom shortcut. To have the poweroff shortcut back add it with a custom shortcut for the following command:
gnome-session-quit --power-off
Note: to be able to add a custom shortcut we may have to clear an already existing shortcut if this uses the same keys.
The GNOME lock screen feature depends on the gnome-screensaver . In case you have removed it or did not install it in a custom environment you will have to install it first.
As a workaround you could create a shortcut (System Settings -> Keyboard -> Shortcuts tab) and assign it to command gnome-screensaver-command -l
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Best Answer
Lock is a function of the screensaver. It will stop working if your screensaver is not running - for example, if it gets removed your start-up applications.
Go to: Settings > Session and Start-Up > Application Autostart
And check: [x] screensaver.
Otherwise, it may not be likely your screensaver would stop working unless it has actually been removed. It is operated by the script called xflock4, which you will find in the directory /usr/bin/. It checks for three different possible screensavers and will run whichever one happens to be there: xscreensaver, light-locker or gnome-screensaver. To rule out the possibility that your problem is that you somehow lost your screensaver, simply attempt to install one (e.g. with the command 'sudo apt-get install xscreensaver'). If the program is already installed, it will tell you so. It seems the xfce4 panel button to 'lock screen' runs xflock4. It should also be set to operate by keyboard shortcut (CTRL-shift-L), which you can see by going: Settings > Keyboard > Application Shortcuts.