Device state "unavailable"



Hello,

since a unknown period of time I can't manage my ethernet interface
via network manager. `nmcli d` says its state is unavailable. This
fix[0] didn't work, after restarting the service it kept being
unavailable. However, the connection works with wicd instead of
network-manager. Hence I guess it is not a problem with an underlying
system (e.g. inetd). Of course I removed wicd again, hence it should not
interfere with NetworkManager.

I removed network-manager in its entirety and installed it again from
the debian repos. enp0s31f6 kept being "unavailable". I did a bit
research, but all solutions I found apply to "unmanaged" devices and
didn't worked out for me.

My last guess would be that bridge-utils or virt-manager meddled with my
my NetworkManager-configurations. But I removed them via apt and can't
find any leftovers in /etc/network/interfaces
or /etc/NetworkManager/NetworkManager.conf


Did someone else encountered this problem? Did you solve it?y

Some infos:

$ nmcli d
DEVICE     TYPE      STATE        CONNECTION 
wlp3s0     wifi      connected    [AP]   
enp0s31f6  ethernet  unavailable  --         
lo         loopback  unmanaged    --         

$ dpkg-query -l network-manager*
[…]
ii  network-manager                   1.6.2-3
ii  network-manager-gnome             1.4.4-1
[…]

$ uname -a
Linux t460p 4.9.0-3-amd64 #1 SMP Debian 4.9.25-1 (2017-05-02) x86_64
GNU/Linux

$ cat /etc/debian_version 
9.0

Thanks.

[0] https://bugzilla.redhat.com/show_bug.cgi?id=990139 
-- 
Mit freundlichen Grüßen / Best Regards

Mark Kettner

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