I purged the PPAs but Is there any way I can roll-back to older working
libgtk (i guess 3.14)?
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https://bugs.launchpad.net/bugs/1480694
Title:
Screen turns white after pressing Print Sc
You are using a PPA version of GTK
libgtk-3-0 3.16.3-0ubuntu1~vivid2 [origin: unknown]
which causes this bug. It's not something which happens in Ubuntu 15.04,
so not a problem we can fix there.
You could ask the PPA maintainer to backport gnome-screenshot from
'wily' which has this problem fi