Before it worked in the beginning of Ubuntu 14.04 installation (same with Linux Mint Cinnamon 17.2) after hitting F6 and checking either one of:
Must be something with the HP BIOS since on my newer desktop PC (also with nVidia card) installation went smooth. There is not much to change there, though, just checking/unchecking UEFI.
Any clues, please?
Thank you, Marek