I upgraded a laptop from LL 3.8 to LL 4.2 via a clean install of LL 4.2 two days ago. I think I've counted about three .deb files I needed to install post LL 4.2 upgrade. When I click on the .deb file, gdebi opens, and I click on Install. The window disappears, and nothing happens. I resort to installing the software using the command line with the "sudo dpkg -i" approach. That does work.
I have used the reinstallation option in Install/Remove Software on the gdebi package to no avail. Any suggestions?