I have updated my ubuntu version to the intrepid one. Everything went fine but the network manager.
Although I had internet connection, my network manager wasn't able to edit the network configuration. When I press with the right mouse buttom it said: device is unmanaged.
This is due to a reported ubuntu bug. I did as follows:

- edit the /etc/NetworkManager/nm-system-settings.conf file and chage managed to true:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

- Then, kill the settings process:

mcm@McM:~$ sudo killall nm-system-settings

- to launch and use the network manager, use the gnome applet:

mcm@McM:~$ nm-applet

with these two simple actions, my network manager is on again ready to use.

gruss Gott.