the command line gives

filippo@iluvatar:~$ sudo update-manager
Traceback (most recent call last):
File "/usr/bin/update-manager", line 32, in
from UpdateManager.UpdateManager import UpdateManager
ImportError: No module named UpdateManager.UpdateManager

I tried to remove and reinstall update-manager and update notifier but
the problem persists.

What module is missing? How to reinstall it?

Thanks,

Filippo