It appears Software Boutique does add this source correctly, but Opera's packaging has a typo in their "postinst" script which overwrites this file.
This needs reporting to Opera to be fixed in their packaging upstream, otherwise the other choice is to drop it from Software Boutique. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1663523 Title: Adding Opera Browser from Software Boutique breaks apt in Ubuntu Mate 16.04.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1663523/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs