Thanks for your bug report. Do you have anything interesting in ~/.xsession-errors? Can you try to make a backtrace of gnome- screensaver?
gdb gnome-screensaver
...
(gdb) break gdk_x_error
(gdb) run
...
(gdb) thread apply all bt
** Changed in: gnome-screensaver (Ubuntu)
Status: Unconfirmed => Needs Info
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Lock Screen not working anymore
https://launchpad.net/bugs/68123
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