Comment 25 for bug 305606

The same story with network manager. After an upgrade of Karmic, it stopped to show the sattus of the network, while everything worked. Problem was corrected as follows:

Status of interfaces:
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.0.234
netmask 255.255.255.0
gateway 192.168.0.1

Modified network manager config:
~$ cat /etc/NetworkManager/nm-system-settings.conf
[main]
plugins=ifupdown,keyfile
#no-auto-default=00:19:66:f7:b6:e4, <============== modif
[ifupdown]
#managed=false
managed=true <============== modif

Restart with /etc/init.d/network-manager restart