Start an X application from tty
On Mint 13 my Cinnamon crashed and the system couldn’t let me restart it (no Alt F2 or similar), so I found this solution:
-Go in tty1 (Ctrl Alt F1) and Login
-Write DISPLAY=:0 [command], example: DISPLAY=:0 cinnamon
-If you have multiple X sessions, you should know the number and use it instead of 0
sabas place 