Disabling automatic download of software updates in GNOME 3.14 on Debian Jessie
GNOME Software application automatically downloads the packages to be updated and presents a notification in the notification area. It might be a good idea to disable it avoid excessive data usage on metered internet connections.
To do it from the command-line
$ gsettings set org.gnome.software download-updates false
Or open dconf-editor and navigate to
org -> gnome -> software
and unselect this key
download-updates