Comment 4 for bug 2039213

This is basically a duplicate of bug 2034986, but the reason the fix doesn't work for you is that you invoke the upgrade directly as root via sudo, which means some environment variables that are needed are not preserved in the upgrade process. Note that the upgrader will invoke the necessary part of the script with root privileges itself (it which point you would be prompted to authenticate), so it's preferred that you just call e.g. `update-manager -d`, not `sudo update-manager -d`.