It was fixed with https://bugs.launchpad.net/ubuntu/+source/update-notifier/3.192.15 (but the bug closing syntax was wrong so launchpad didn't automatically pick it up)
It was fixed with https:/ /bugs.launchpad .net/ubuntu/ +source/ update- notifier/ 3.192.15 (but the bug closing syntax was wrong so launchpad didn't automatically pick it up)