*** This bug is a duplicate of bug 1867610 *** https://bugs.launchpad.net/bugs/1867610
The same happens in Debian 10, so that's not Ubuntu-specific. Reproduction steps: 1. Download a .deb file, for example Jami from https://dl.jami.net/ring-manual/debian_10/jami-all_amd64.deb. 2. If you try to open it from your browser, it'll invoke the Archive Manager application, which isn't useful (it should really open the gnome-software application 3. If you choose to open it in the Gnome Software application, you get the message: "Failed to install: not supported". My Debian 10 VM is running amd64, and so is the .deb file linked above. I hope that helps! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1872522 Title: Ubuntu software will not install .deb files on focal fossa To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1872522/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs