Linux Keyboard shortcuts

Creat your keyboard shortcuts in LINUX
Go to the System Preferences Keyboard Shortcuts menu item:

There you can see some options, Scroll down till you see the "Logout" item. Click in the Shortcut column, and when it changes to "New accelerator…", hit the <Alt><Ctr><Delete>. then click the close button. Thats it..

Now if your press alt+ctrl+delete you can see the logout menu.