Error editing connection: did not find a connection with UUID ‘(null)’
sudo vi /etc/network/interfaces
#interfaces(5) file used by ifup(8) and ifdown(8)
#auto lo
#iface lo inet loopback
#auto ens33
#iface ens33 inet dhcp
用#将文件全部注释
Next, stop and restart the NetworkManager.service with:
sudo systemctl stop NetworkManager.service
sudo systemctl start NetworkManager.service
停止网络服务，然后重启，如果不行就重启系统。