Reverting Netplan to Interfaces

Install ifupdown

$ sudo apt-get install ifupdown

Edit the /etc/default/grub file

$ sudo nano /etc/default/grub

Add the following to your GRUB_CMD_LINUX value.

  • Save and exit the file (CTRL+X, Enter, then Y)
  • Now update the grub using the following command
$ sudo update-grub

Now you can add all the interface details in /etc/network/interfaces file and reboot the Ubuntu PC/server.