Change Ubuntu 20.04 server netplan to use NetworkManager instead of networkd

netplan2NM.sh

#!/usr/bin/env bash

# netplan2NM.sh
# Ubuntu server 20.04  Change from netplan to NetworkManager for all interfaces

echo 'Changing netplan to NetowrkManager on all interfaces'
# backup existing yaml file
cd /etc/netplan
cp 01-netcfg.yaml 01-netcfg.yaml.BAK

# re-write the yaml file
cat << EOF > /etc/netplan/01-netcfg.yaml
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: NetworkManager

EOF

# setup netplan for NM
netplan generate
netplan apply
# make sure NM is running
systemctl enable NetworkManager.service
systemctl restart NetworkManager.service

echo 'Done!'

This worked for me too on 20.04 though on running the script there was an error re 01-netcfg.yaml not being found. Thanks. 👍

• added correct yaml for Ubuntu Server 20.04.3
• added installation of networkmanager

https://gist.github.com/poltpolt/772618cfead9c1b63b246584024d7765

for anyone who may need it, i wrote a updated version for 22.04!
https://github.com/M00NL16H7/randomScripts/blob/main/netplan2NM.sh

you need to add to install NetworkManager, by default is not installed

Yes, that would be a reasonable addition. What I have is only for updating netplan. On Ubuntu Server NetworkManager is not installed by default but I believe it is for Desktop. (?)

You would probably want to add something like
sudo apt-get -y -qq install network-manager
sudo systemctl enable NetworkManager --now