apt-get, apt and aptitude work all just fine and produce no errors nor warnings.
update-notifier/apt-check is, indeed, responsible for the error message. gioele:~$ /usr/lib/update-notifier/apt-check Error in sitecustomize; set PYTHONVERBOSE for traceback: AttributeError: module 'sys' has no attribute 'setdefaultencoding' 0;0gioele:~$ echo $? 0 Please note the missing newline between the end of the output of apt- check and the prompt. gioele:~$ which python /usr/bin/python gioele:~$ readlink -f /usr/bin/python /usr/bin/python2.7 Thank you Sebastien for the triaging. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-software in Ubuntu. https://bugs.launchpad.net/bugs/1702467 Title: software update indicator crashes and displays wrong error message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1702467/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs