As you've discovered there was a syntax error in your sources.list file for equinox ppa. This may have been due to a bug in add-apt-repository as it looks like the 'm' in 'main' is missing from that sources.list. I'll move the bug to that pacakge.
** Package changed: update-manager (Ubuntu) => software-properties (Ubuntu) ** Summary changed: - Could not initialize the package information + add-apt-repository stripped m from main -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/994515 Title: add-apt-repository stripped m from main To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/994515/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
