Reverting Netplan to Interfaces
See Also
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 to your GRUB_CMD_LINUX value.
GRUB_CMDLINE_LINUX="netcfg/do_not_use_netplan=true"
- 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.