After installing you'll need to start it from a terminal. There is no desktop shortcut for the app. So pop open a terminal and enter hdhomerun_config_gui. If it starts up then great, if not make sure you have the gtk+1.2 libraries installed.
If you're searching for HDHomerun Prime configuration software for Linux this might help. If you're looking for a way around the QAM channel encryption this will NOT help. I know, it's a bummer.
Download deb Package from my Google Drive