i installed netrunner 17.06 some months ago and i wondered why it never dated up “correctly” since the only updates apt-get did were for skype and another proprietary programm.
So when i have a look at the sources.list via apt edit-sources the only two entries are
Sourceslists are stored nowadays in the folder /etc/apt/sources.list.d/ as separate files.
By default you won’t get any updates. If you want to have rolling updates with the potential of breaking things you need to follow this guide: https://www.netrunner.com/debian-rolling/