[FIXED] by Ubuntu update packages, no more need it.
Recently, I tried to upgrade my NB from 8.04 to 8.10. That’s pretty smooth and good. I need to ethernet device hot-plug , servers bring up & down. Previous that are base on ifupdown. But fail on Ibex, if I put some actions on /etc/network/interfaces, I can not use NetworkManager. It’s so bad to me.
Lucky, NetworkManger has a configure file in /etc/NetworkManger, named “nm-system-settings.conf”. change
That’s well done