Neither repository provides the packages you mentioned for xenial. The first only provides humanitary-icon-theme, the other no firefox-next, only firefox, firefox-dev, and some locale and debugging packages.
** Changed in: apt (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/1556728 Title: apt-get update not fetching packages in external repositories To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1556728/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs