Devterm CM3 ubuntu server image

ubuntu-21.04-preinstalled-server-armhf+raspi.img

sudo apt remove linux-image-raspi linux-image-5.11.0-1007-raspi -y
sudo apt install net-tools network-manager -y

wget -O - https://raw.githubusercontent.com/clockworkpi/apt/main/debian/KEY.gpg | sudo apt-key add 
echo "deb https://raw.githubusercontent.com/clockworkpi/apt/main/debian/ stable main" | sudo tee -a /etc/apt/sources.list.d/clockworkpi.list
sudo apt update && sudo apt install devterm-thermal-printer devterm-keyboard-firmware devterm-fan-temp-daemon-rpi devterm-thermal-printer-cups devterm-kernel-rpi devterm-audio-patch devterm-backlight-rpi -y