I was using virtualbox on a laptop and closed the lid which locked the screen and sleep the computer. Now it came back from sleep, the screen is locked, but I can not type my password. The mouse work, I can set focus in the password box, but typing does nothing.

I guess the keyboard is held by virtualbox.

I tried plugin in a keyboard, no luck. I tried killing unity-panel-service --lockscreen-mode, it seems to have a watchdog that restart it.

I'll find some command line to sleep my vm, but is there anyway to unlock the screen from command line ?