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:
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.
1, If you met this error while restart network:
Nov 08 11:07:07 debian kernel: bnx2 0000:01:00.0: firmware: failed to load bnx2/bnx2-mips-09-6.2.1b.fw (-2)
Nov 08 11:07:07 debian kernel: bnx2 0000:01:00.0: Direct firmware load for bnx2/bnx2-mips-09-6.2.1b.fw failed with error -2
You need to install the NIC driver: DELL_LAN.iso : mount the iso,
mount -t iso9660 DELL_LAN.iso /dstdir
and use command `dpkg -i *.deb` install the two deb packages in the iso.
2, Install the `vlan` package or use this deb package vlan_1.9-3.2+b1_amd64.deb which is download from offical website or download from this website vlan_1.9-3.2+b1_amd64.deb .
3, Add such like this configure in the network conf file: "/etc/network/interface"
iface vlan170 inet static
iface vlan174 inet static
and then, restart the networking.
4, Run the cmd `ip r s` will get some route rule like this (these will be generate automatic):
root@debian:~# ip r s
default via 10.17.0.1 dev vlan170 onlink
10.17.0.0/22 dev vlan170 proto kernel scope link src 10.17.3.249
10.17.4.0/22 dev vlan174 proto kernel scope link src 10.17.7.249
Finish or you can change the route rule by yourself.