Your /etc/apt/sources.list file is missing entries for the main and restricted pockets of the ubuntu archive. You'll want to add something like the following:
deb http://la-mirrors.evowise.com/ubuntu/ xenial main restricted ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1790012 Title: failed upgrade? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1790012/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
