You can just do this to get rid of netplan so you can keep the normal Debian /etc/network/interfaces apt remove netplan.io apt install -y ifupdown Don't forget to actually populate /etc/network/interfaces now.........

Step 1.) Upgrade to Debian 11 first The process to go to Debian 12 is not as smooth as 11, when trying to upgrade from Debian 10. In fact, it doesn't work directly, so you'll first need to follow this guide to update to Debian 11, reboot and come back here if successful. Step 2.) Update sources.list Update your /etc/apt/sources.list like this: deb http://........