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:
change “managed=false” to “managed=true”
And uninstall “connman” in Synaptic Package Manager.
It works after reboot.