After I test indicator network, i don’t like it. So uninstall indicator network by Synaptic Package Manager. But network manager can’t work after uninstall indicator. network manager alter “networking disable”.
I search some way to fix it, lots of ways are not good.
Here is my way to fix it:
Edit /etc/NetworkManager/nm-system-settings.conf
change “managed=false” to “managed=true”
And uninstall “connman” in Synaptic Package Manager.
It works after reboot.
Ref: http://www.omgubuntu.co.uk/2010/05/help-test-ubuntu-10-10s-proposed-network-indicator-applet-ppa/