Now that upgrades from 14.04 LTS are enabled, the upgrade still fails for the following repos:
W:Failed to fetch http://172.22.152.125/ubuntu/dists/xenial/main/source/Sources 404 Not Found
W:Failed to fetch http://172.22.152.125/ubuntu/dists/xenial/restricted/source/Sources 404 Not Found
...
E:Some index files failed to download. They have been ignored, or old ones used instead.
Are there other locations we can use? Or will the script get updated?