[Trisquel-users] Re : Ctrl+alt+del equivalent?

[lcerf]

Use the "System Monitor" in the "System Settings".  To kill a graphical  
application with one click on its window, execute 'xkill' (for instance in  
the command prompt you get with Alt+F2).  'killall [process-name]' in a  
terminal for any program.  Ctrl+Alt+F1 gets you a text session (if the  
graphical session is frozen) where you can 'killall' or even 'sudo restart  
lightdm' (assuming you use Trisquel 7's default display manager) to restart  
the whole graphical session.  REISUB to safely reboot a system that does not  
respond at all (but not because of a kernel panic):  
https://en.wikipedia.org/wiki/Magic_SysRq_key#Uses