Ubuntu 12.04 By a mistake, I stopped lightdm. Then switched to tty1, and rebooted. Now, After startup, It just came a black screen with a cursor, can type nothing.
I tried Ctrl+F1 to F12 (and Ctrl+Alt+F1 to F12), nothing works.
There might be something wrong with X server (Because I cannot type in, there is no way to try