This bug is probably due to gtk+2.0 update (2.21).
It's either internal to gtk or maybe lablgtk2 needs an update?
In any case, it's not directly related to laby.
Laby uses GDraw.pixmap without specifying a colormap. But reading
lablgtk source code, that means that
Thank you for taking the time to report this bug and helping to make
Ubuntu better. This bug did not have a package associated with it, which
is important for ensuring that it gets looked at by the proper
developers. You can learn more about finding the right package at