Ubuntu 16.04 can’t connect the internet by using 802.1x security

Case 1, because of the UI bug in Ubuntu 16.04, you should edit the connection file "/etc/NetworkManager/system-connections/name-of-your-connection" enter your password value in [802-1x] block like this:

[802-1x]
altsubject-matches=
eap=peap;
identity=account
password=password
phase2-altsubject-matches=
phase2-auth=mschapv2

Case 2, because of the USB which is a bootstrap Ubuntu system was inserted in the usb interface, after me reboot the Ubuntu system, the connection always fail. After remove the USB driver, it will work.

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