2.2.1. How to revert from netplan to legacy interfaces file


It’s always good to make sure that you have ifupdown installed and some sort of backup or way to fallback to a previous version of the OS if this breaks the network.

  • Install ifupdown

$ sudo apt-get install ifupdown
  • Edit the /etc/default/grub file

$ sudo nano /etc/default/grub
  • Add the following line:

  • 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.