Comment 3 for bug 1693463

Sam Korson who also got this bug said ( https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1672424/comments/56 ):

'my issue seems to have been resolved now either way; I just noticed that there were some "system updates" available from inside Software and I installed those and rebooted. I can now install .deb files without problems. Great!'

But most users don't go to that part of Ubuntu Software regularly? Why do these need to be installed? I don't understand why there's two different graphical update mangers in the first place...