Comment 9 for bug 551111

A temporary workaround disabling what I believe is causing this crash (GTK complications triggered by a hack to make the settings button one single button with a menu dropdown instead of a separate button and arrow) is uploaded to the PPA in 0.1~public.lucid.bzr64. It looks like the build queue is extremely backed up right now, though, so it may be awhile before the package is ready.

You can make the change manually to your installed copy if you wish:
1. gksudo gedit /usr/bin/pithos
2. comment out (place the character # at the beginning) line 173
"unifyMenuToolButton(self.builder.get_object("toolbutton_options"))"
so it looks like
"#unifyMenuToolButton(self.builder.get_object("toolbutton_options"))"
3. save and close the file

Please let me know if this solves the problem.