Comment 4 for bug 1173013

I have the same issue, upgraded from 12.10 and cannot install .deb packages with gdebi. This is what happened, I wanted to install Virtual Box with the .deb package that they have on their site. I used the file manager to get to the .deb file and right clicked on it and selected Open With > Gdebi Package Installer. GDebi opens fine but when trying to install it asks for a password and the admin password won't work. This worked fine when I was on 12.10. I managed to install the package doing the same thing but instead of choosing GDebi, I chose Open With Ubuntu Software Center, and it installs fine with that. I haven't been able to install the virtual box extensions though because it asks for an administrative password.