The ubuntu-minimal package was not found after rewriting your sources.list file. Its possible this was due to an error communicating with the mirror of Ubuntu which you use. You might try using a different mirror, or checking your network. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518621 Title: upgrade from 15.04 to 15.10 failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1518621/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs