I found the solution: https://askubuntu.com/questions/1248176/ideapad-5-15are05-elan-touchpad-not-working-on-20-04-nor-on-18-04/1257523#1257523
Edit /etc/default/grub and add "initcall_blacklist=elants_i2c_driver_init" to GRUB_CMDLINE_LINUX, run update-grub, power down the laptop and start it again.
I found the solution: https:/ /askubuntu. com/questions/ 1248176/ ideapad- 5-15are05- elan-touchpad- not-working- on-20-04- nor-on- 18-04/1257523# 1257523
Edit /etc/default/grub and add "initcall_ blacklist= elants_ i2c_driver_ init" to GRUB_CMDLINE_LINUX, run update-grub, power down the laptop and start it again.