The reason this is not working is the gnome-software you are running is not the process that actually shows the package. You will already have gnome-software running so it just passes the string to the existing process. Since this process is probably running in your home directory it doesn't work on non-absolute paths unless you happen to be in your home dir.
** Summary changed: - Cannot install Debian files outside of the repositories + Installing .debs from the command line fails for non-absolute paths -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1672424 Title: Installing .debs from the command line fails for non-absolute paths To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-release-notes/+bug/1672424/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs