[Bug 76634] Screen won't unlock

[spif]

Public bug reported:

Binary package hint: gnome-screensaver

After upgrading to 2.17.4 on my feisty system, the screen won't unlock.
The unlock dialog hangs and eventually dies leaving the screen locked.
If I switch to a VT and kill gnome-screensaver it unlocks.  I have tried
rebooting several times, clearing out configs, tracing the process, etc.
It appears gnome-screensaver is trying to access the /etc/shadow file
unsuccessfully.  When I run xscreensaver it works fine.  When I manually
downgrade to 2.16.1 it works fine.  Currently I am running on 2.16.1
with no problems.  I will see about attaching the strace output, if
launchpad will let me.  Otherwise please let me know if you want me to
e-mail it to you.

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Screen won't unlock
https://launchpad.net/bugs/76634