HP Laptop Keyboard Not Working At Boot Start

Original article is for Linux Mint, but this affects Ubuntu as well.

Warning

This disables the caps lock indicator.

sudo vi /etc/default/grub

Update the GRUB command line to include the i8042 entry, e.g.:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.dumbkbd=1"

Save the file, then run sudo update-grub and reboot.