No network after upgrade to 16.04 and how to fix
After upgraded to Ubuntu 16.04 from 14.04, my server network stop functioning (cannot ping gateway or anything...). I tried several things but none of them works (especially this one ). So I ran these command to check my server's network status: 1. $ sudo ifconfig => There's only the loopback interface show up. Where is my eth0? 2. Then, I check the network status: $ sudo service networking status It said it could not bring up the eth0 interface because it find no interface name eth0 on the server. 3. Finally, I tried and "the thing" shown up: $ sudo ifconfig -a ens192... 4. And because I statically assigned the interface's configuration so I have to go in and change it to reflect the new name of the interface: $ sudo nano /etc/network/interfaces ... auto ens192 iface ens192 inet static ... Bravo!!!