I have just installed python-apt and now it works. I am also running on a virtual distribution, python-apt wasn't installed before.
Maybe python-apt needs to be a dependancy of ubuntu-release-upgrader- core -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/994152 Title: do-release-upgrade: Can not run the upgrade, 'No such file or directory'. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/994152/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs