To set kernel boot options, you must edit your GRUB configuration. You can do this temporarily for a single boot by entering the GRUB menu. If you do not get to see the GRUB boot menu after the bios automatically, you may have to press Shift key after the bios logo to get in to GRUB:
Select the default Ubuntu kernel (usually the top one), and rather than pressing Enter, press E to edit.
Press Down Arrow until you get to the line that starts with
and press End keys to position your cursor at the end of the that line usually ending with
Now you can type in additional kernel options like
See also Ubuntuforums "Thread: How to set NOMODESET and other kernel boot options in grub2"