@gernophil: After you successfully installed these, have you yet tried doing a "sudo apt-get update"?
I'm wondering if the respective repositories (of the debs you are installing) are getting the weak-key-rejections described here: http://askubuntu.com/a/760348/256054 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573408 Title: GNOME Software does not install third-party .deb packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1573408/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs