Comment 6 for bug 1264368

Messages of the form "GLib-CRITICAL **: Source ID 6 was not found when attempting to remove it" also occur when running GParted.

For example on Ubuntu GNOME 14.04 beta1:

$ sudo apt-get install gparted
$ sudo gparted
======================
libparted : 2.3
======================

(gpartedbin:2677): GLib-CRITICAL ** Source ID 7 was not found when attempting to remove it

(gpartedbin:2677): GLib-CRITICAL ** Source ID 6 was not found when attempting to remove it

(gpartedbin:2677): GLib-CRITICAL ** Source ID 26 was not found when attempting to remove it
...

I have only seen this occur with Ubuntu 14.04. My suspicion is that there might be a regression in GLib, or possibly a mismatch with GTK and GLib.