How do I successfully configure pi-fancontrol on a Pi 4?

I have a Raspberry Pi 4 with Adafruit's Official Case fan, and am running Ubuntu 20.10. I have installed the pi-fancontrol snap, but I can't get it configured using the instructions at https://snapcraft.io/install/pi-fancontrol/ubuntu.

$ sudo snap install pi-fancontrol
pi-fancontrol 0.1 from Oliver Grawert (ogra) installed
$ sudo snap connect pi-fancontrol:gpio pi:bcm-gpio-14
error: snap "pi" has no slot named "bcm-gpio-14"

snap list doesn't show that the pi snap is installed, so maybe that's the problem. There are instructions for that at https://snapcraft.io/install/pi/ubuntu.

$ sudo snap install pi --beta
error: cannot perform the following tasks:
- Mount snap "pi" (11) (cannot install gadget snap on classic if not requested by the model)

Googling that error message does not turn up any useful results. Where do I go from here?

Solution 1:

pi-fancontrol snap is currently broken for Ubuntu Desktop.

Manually overriding worked for me.

sudo nano ../../boot/firmware/config.txt

To set the threshold at 80 degrees Celsius, add the following line in it:

dtoverlay=gpio-fan,gpiopin=14,temp=80000

Save the file by pressing Ctrl + X, and press Y, and press Enter.

Reboot the system now, it is done.