Downloading the source from https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:0.192.4 the line number for this error message is 1060 and as e is set to None before it is used.
Downloading the source from https:/ /launchpad. net/ubuntu/ +source/ ubuntu- release- upgrader/ 1:0.192. 4 the line number for this error message is 1060 and as e is set to None before it is used.