I encountered the same problem for Ubuntu 16.04.
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https://bugs.launchpad.net/bugs/1251281
Title:
gnome-session-flashback/Unity fails to start without hardware
acceleration in
** Also affects: putty (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1264368
Title:
GLib-CRITICAL **: Source ID was not found when attempting to