Similar fix worked in my setup (Ubuntu 12.04 64-bit server install, with xubuntu-desktop), with slightly different file name.
Make backup of /etc/NetworkManager.conf
Edit /etc/NetworkManager.conf (as root).
After "managed," change "false" to "true"
sudo service network-manager restart
Similar fix worked in my setup (Ubuntu 12.04 64-bit server install, with xubuntu-desktop), with slightly different file name.
Make backup of /etc/NetworkMan ager.conf ager.conf (as root).
Edit /etc/NetworkMan
After "managed," change "false" to "true"
sudo service network-manager restart
Thank you!