Comment 3 for bug 930972

Both .desktop files are the same.
As workaround on laptop I've set
NoDisplay=false
and then it displays in dash.
Running from dash it still doesn't request authentication as on pc, but at least it doesn't crash.

[Desktop Entry]
Name=Software Sources
GenericName=Software Sources
Comment=Configure the sources for installable software and updates
Exec=software-properties-gtk
Icon=software-properties
Terminal=false
NoDisplay=true
X-MultipleArgs=false
Type=Application
Categories=GNOME;GTK;Settings;X-GNOME-SystemSettings;
MimeType=text/x-apt-sources-list;
X-KDE-SubstituteUID=true
X-Ubuntu-Gettext-Domain=software-properties