In the event that the mirror in your /etc/apt/sources.list file is no longer an official mirror of Ubuntu, the release upgrade process will create a new sources.list file for you with only main enabled for the release to which you are upgrading. This will create a poor upgrade experience. This will need to be fixed before or with the fix for 1463680.
In the event that the mirror in your /etc/apt/ sources. list file is no longer an official mirror of Ubuntu, the release upgrade process will create a new sources.list file for you with only main enabled for the release to which you are upgrading. This will create a poor upgrade experience. This will need to be fixed before or with the fix for 1463680.