TrackpadAsTouchscreen

Credits

All the credit goes to u/emptythevoid, who mentionned the method in this Reddit thread. I just made some scripts to make it more convenient for me.

Prerequisites

Install xinput-calibrator :

sudo apt install xinput-calibrator

Tutorial

Run the following command : udevadm info -e | grep -i -A 10 touchpad to try to find the modalias for your touchpad. Exemple : input:b0018v0488p121Fe0100-e0

Then, replace [MODALIAS] with yours in the following script :

sudo echo -e "id-input:modalias:[MODALIAS]*\n ID_INPUT_TOUCHPAD=0\n ID_INPUT_TOUCHSCREEN=1" >> /etc/udev/hwdb.d/60-touchpad.hwdb
sudo systemd-hwdb update
sudo reboot -f

To run it, simply do : sudo bash [NAMEOFTHESCRIPT]

Your computer is gonna reboot, and then you can run xinput_calibrator and touch the four corners of your trackpad. If it doesn't work, something went wrong.

To disable this, run this script (still using sudo bash [NAMEOFTHESECONDSCRIPT]) :

sudo rm -f /etc/udev/hwdb.d/60-touchpad.hwdb
sudo systemd-hwdb update
sudo reboot -f