Not sure if this helps but I'm experiencing the same gnome-session error as OP on a Debian 8.6 Jessie (amd64) system (regardless of kernel version, in case that matters) with gnome-session 3.14.0-2.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/1582496 Title: GLib-GObject-CRITICAL failures during Ubuntu 16.04 bootup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1582496/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs