Ubuntu Server LTS

4G usb modem

qmicli -d /dev/cdc-wdm0 --wds-reset
qmicli --device=/dev/cdc-wdm0 --wds-start-network="apn=4g.tele2.se" --wds-follow-network  &
sleep 5 && systemctl restart systemd-networkd &

Reset USB

echo 0 | sudo tee /sys/bus/usb/devices/1-1/authorized
sleep 3
echo 1 | sudo tee /sys/bus/usb/devices/1-1/authorized

Bluetooth

/etc/systemd/system/multi-user.target.wants/hciuart.service
sudo hciattach /dev/ttyAMA0 bcm43xx 921600 -   # TWO TIMES!! WHY?
hcitool dev
bluetoothctl

https://simpleit.rocks/linux/shell/connect-to-bluetooth-from-cli/

How to disable cloud-init in Ubuntu

Prevent start

Create an empty file to prevent the service from starting

sudo touch /etc/cloud/cloud-init.disabled

Uninstall

Disable all services (uncheck everything except "None"):

sudo dpkg-reconfigure cloud-init

Uninstall the package and delete the folders

sudo dpkg-reconfigure cloud-init
sudo apt-get purge cloud-init
sudo rm -rf /etc/cloud/ && sudo rm -rf /var/lib/cloud/

Restart the computer

sudo reboot

Sources