Laptop doesn't power off on shutdown, after upgrade to 15.04 and gnome 3.16
I have upgraded to Gnome 3.16.1 and I am no longer having this problem. I'm guessing it was fixed by this change:
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gtk+
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Overview of changes in GTK+ 3.16.2
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* Bug fixes:
[...]
747689 [...]
GtkApplication: Prevent more crashes around shutdown
[...]
from https://www.mirrorservice.org/sites/ftp.gnome.org/pub/GNOME/core/3.16/3.16.1/NEWS