I installed Ubuntu 20.04 on my laptop a few days ago. Previously the laptop had Windows 8.
While installing I was using an external keyboard. Now my inbuilt keyboard is not working; even the lights on capslock button etc are not working. It's not even working while booting. I am new to Ubuntu so I don't know where to start solving this problem.
Try this. https://techwiser.com/fix-keyboard-not-working-in-ubuntu-18-04/ . If it doesn't work, you have to reinstall the OS as suggested here https://appuals.com/fix-ubuntu-20-04-lts-keyboard-and-mouse-not-working/ . It could be that the keyboard is not working because you had an external keyboard connected during the installation process. So you need to reinstall the OS.
Try to look also here Ubuntu 20.04 - keyboard not working
