I can not think how this could be a update-manager bug, its more likely a bug in the default install that it does not come with the Packages.gz information for restricted or a bug in restricted-manager.
** Changed in: update-manager (Ubuntu) Status: New => Invalid -- Misleading error message - software source for package is not enabled https://bugs.launchpad.net/bugs/134918 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs