VPS offline after restart

How to fix the network error while connecting to your VPS after a restart.

1. Login using the VNC button
2. If using Ubuntu 18+ run the following command

   nano /etc/netplan/50-cloud-init.yaml​

3. Once you run the command, add the line

   on-link: true​

4. The file should now look something like this 

   # File is autogenerated by Cloud-Init and will be recreated after each boot
   network:
     version: 2
     ethernets:
       eth0:
         match:
           macaddress: 52:54:00:29:71:04
         set-name: eth0
         addresses:
         - 51.158.47.157/24
         nameservers:
           addresses: [8.8.8.8, 8.8.4.4]
         mtu: 1400
         routes:
         - scope: link
           to: 163.172.21.84/32
           via: 0.0.0.0
         - to: 0.0.0.0/0
           via: 163.172.21.84
           on-link: true​

5. You can see the new line at the bottom. 
   
   Once you do this save the file and restart the VPS. It should now have a network connection.