eNdiD, в 15.04 это не работает:
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/usr/bin/viberwrapper-indicator", line 333, in run
gtk.main_quit()
RuntimeError: called outside of a mainloop