DNS servers in China
https://public-dns.info/nameserver/cn.html
How to easily set up a static ip address in Ubuntu using the GUI(12.04)
https://www.youtube.com/watch?v=o9fJWDoX4nE
How to configure static IP address on Ubuntu 18.10 Cosmic Cuttlefish Linux
https://linuxconfig.org/how-to-configure-static-ip-address-on-ubuntu-18-10-cosmic-cuttlefish-linux