no network (eth0/wlan0) after reinstall of 15.10

[robert]

thanks ralf
On 12.01.2016 09:52, Ralf Mardorf wrote:
> 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/.
>
>
>
there is only /sys/class/net/lo

??
robert
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