Summary: come to the GRUB screen as shown in Figure 1 Move the arrow key so that you stay on this screen instead of proceeding all the way to a normal boot Figure 1 GRUB screen after reboot Next select the kernel that will boot with the arrow keys and type E to edit the kernel line You ll then see something like Figure 2 Figure 2 Ready to edit the kernel line
Image Dimensions: 572 x 429
Image originally found here.