no network (eth0/wlan0) after reinstall of 15.10

[Ralf Mardorf]

On Tue, 12 Jan 2016 09:38:31 +0100, robert wrote
>after reinstalling 15.10 (using the option in its install menu to 
>reinstall preserving user data) I have no entries in 
>/etc/network/interfaces but the local interface.
>
>how can I add the by hand? And have them work of course.
>It looks as if just adding the wlan0 interface to 
>/etc/network/interfaces does not help.

I doubt that the name of the interface is wlan0, the correct name
should be available in /sys/class/net/.