I activated the "xenial-proposed" (which is not in the updates tab, but in the last tab. Don't know the english naming). I've installed the update via:
$ sudo apt-get install gnome-software/xenial-proposed After a reboot I was able to install "dropbox_2015.10.28_amd64.deb" and "google-chrome-stable_current_amd64.deb" and use the software. Se the fix seems to work. -- 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/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 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs