Found in bug #1264368 a possible explanation: gthumb may be passing bad/invalid paramters to `g_source_remove()`.
Also relevant: https://bugzilla.gnome.org/show_bug.cgi?id=721369#c7 > It's not GTK+. GLib recently started throwing a warning when g_source_remove() > is passed garbage (as per warning). Your applications have probably been > broken > for a while, and there's no telling what could actually have happened in the > past when g_source_remove() would happily close any random source because the > programmer got the wrong argument to g_source_remove(). ** Bug watch added: GNOME Bug Tracker #721369 https://bugzilla.gnome.org/show_bug.cgi?id=721369 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1313254 Title: "GLib-CRITICAL **: Source ID ___ was not found" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gthumb/+bug/1313254/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs