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.
$ 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.