It worked! I added a few parameters to grub before but the did not
worked.

For future reference to others:

- Access the grub configuration file by typing in a terminal: sudo nano 
/etc/default/grub
- Find the line "GRUB_CMDLINE_LINUX_DEFAULT" and append i8042.nopnp=1 pci=nocrs
- Save the file and update grub with sudo update-grub
- restart

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https://bugs.launchpad.net/bugs/1881322

Title:
  Touchpad not detected in 'Lenovo V15-IIL model 82C5' after installing
  Ubuntu 20.04

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