live-usb-gui.noarch: W: desktopfile-without-binary /usr/share/applications/live-usb-gui.desktop xdg-su
the .desktop file is for a file not present in the package. You should check
the requires or see if this is not a error

live-usb-gui.noarch: W: empty-%post
live-usb-gui.noarch: W: empty-%postun
live-fat-stick.noarch: W: no-version-in-last-changelog
live-fat-stick.src: W: no-version-in-last-changelog
live-grub-stick.noarch: W: no-version-in-last-changelog
live-usb-gui.noarch: W: no-version-in-last-changelog
The latest changelog entry doesn't contain a version. Please insert the
version that is coherent with the version of the package and rebuild it.

live-usb-gui.noarch: E: summary-not-capitalized (Badness: 20) C zenity-based frontend for live-fat-stick
Summary doesn't begin with a capital letter.

4 packages and 0 specfiles checked; 1 errors, 7 warnings.