Thanks for reporting this issue.
Could you please take a look at the following debugging information?
https://wiki.ubuntu.com/DebuggingScreenLocking
Also, could you please attach your /var/log/auth.log after the problem
has occured?
** Changed in: gnome-screensaver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/655550
Title:
Ubuntu freezes on "Checking" window after Lock Screen
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