Download network-manager.deb and network-manager-GNOME.deb :
Ubuntu 不能正常聯網的可以試試看， 前提是要有DEB包或有另一臺可聯網的計算機用以下載相應的DEB包apt-get install network-manager network-manager-GNOME --reinstall --download-only (The deb package can be found in
/var/cache/apt/archives/ ) Remove the network-manager and network-manager-GNOME apt-get remove network-manager network-manager-GNOME
Install the network-manager : dpkg -i network-manager network-manager-GNOME
