Tested at the same time as #1679435 on Xenial, and I can confirm it fixes the problem.
gnome-software: Installed: 3.20.1+git20170427.0.3d09239-0ubuntu1~xenial1 Candidate: 3.20.1+git20170427.0.3d09239-0ubuntu1~xenial1 Version table: *** 3.20.1+git20170427.0.3d09239-0ubuntu1~xenial1 500 500 http://gb.archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages 100 /var/lib/dpkg/status 3.20.1+git20170208.0.a34b091-0ubuntu1~xenial1 500 500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 3.20.1+git20160420.1.ca63436.ubuntu-xenial-0ubuntu2 500 500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages ** Tags removed: verification-needed-xenial ** Tags added: verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-software in Ubuntu. https://bugs.launchpad.net/bugs/1672424 Title: Cannot install Debian files outside of the repositories To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-release-notes/+bug/1672424/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs