Stop Bluetooth from enabling itself every restart like a horrifying Zombie on PopOS (Ubuntu) or Debian

Shutting it down:

sudo systemctl stop bluetooth.service
sudo systemctl disable bluetooth.service
sudo systemctl mask bluetooth.service

Bringing it back again:

sudo systemctl unmask bluetooth.service
sudo systemctl enable bluetooth.service
sudo systemctl start bluetooth.service

Via https://fostips.com/disable-bluetooth-auto-start-ubuntu-debian/ (if the first thing they suggested, the configuration file, doesn’t work))

Older hard stop way:

For Ubuntu 18.04+, which is what PopOS is, and i confirmed that there was no /etc/rc.local file with l /etc/rc*, askubuntu.com had the answer:

sudo install -b -m 755 /dev/stdin /etc/rc.local << EOF
#!/bin/sh
rfkill block bluetooth
exit 0
EOF

From https://askubuntu.com/questions/67758/how-can-i-deactivate-bluetooth-on-system-startup#2568