Thanks for your bugreport. Your assumption is correct, the upgrader currently carries a list of valid mirrors and considers other sources as 3rd party sources and drops them. This is something we need to fix. Unfortunately its technically challenging because libapt does not export a way to map a sources.list entry to a VerFileIter to determine more about the archive.
Cheers, Michael ** Changed in: update-manager (Ubuntu) Importance: Undecided => Medium Status: Unconfirmed => Confirmed -- restricted component lost from sources.list during upgrade https://launchpad.net/bugs/68467 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs