Lock his computer in his absence - Ubuntu Linux.

When you leave a few minutes, you can lock your Linux computer so that nobody can access your data. Then you can find your session as you left it.
 

1- Simultaneously press the Ctrl, Alt and L.

2- Your session is locked and the screensaver started.

 

 

 3- When you return, move the mouse and enter your password. Click Unlock.

4- You find your session as you had left it: software running, open documents, etc..