There is several instances of "gnome-screensaver" running when this bug occurs.
When the screen is stuck on "checking..." you can verify this by logging in in 
a different tty (with ctrl+alt+F1 or F2, etc...) and try ::
pstree -p | grep "screen" 

(-p is for having PID needed to kill the process)

Here you can see that you have several instance of "gnome-screensaver" running. 
Now, you just have to kill one of screensaver by :
sudo kill #PID

and go to tty7 with ctrl + alt + F7

Does anybody know why several gnome-screensaver are running ?

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https://bugs.launchpad.net/bugs/744619

Title:
  Screen doesn't unlock; stuck on "Checking"

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