Date: 2014jun13 OS: Linux Distro: Fedora 20 Q. Why does "Gnome Software" (The GUI program) not show any updates? A. It only checks for updates once a day so if you don't leave your computer running all the time it doesn't find anything. You can do:

dnf update

on the command line or change how often it checks:

Launch "Dconf Editor" click to key "org.gnome.settings-daemon.plugins.updates" Change value "frequency-get-updates" which is in seconds to something else. The default is 86400 or a day. You could change it to 3600 which is hourly.

I think there should be a button in Gnome Software to check for updates now.