My Laptop(1.5 yrs) is dual-booted with Windows 10(default) and Ubuntu Linux.The function keys don't work if I want to adjust the brightness or other aspects and while running BIOS the arrow keys don't work. I'd tried uninstalling/reinstalling the keyboard (PS/2) driver but in vain. I even tried the HP hardware diagnostics test for the keyboard but then they all seem to work except for the delete key(which is how that too failed).My language settings are fine and I have ensured that the filter keys have been unchecked.