I think it is not a problem for many people to find out every time you start your Ubuntu and find out the boot up splash screen is 640 x 480, instead of your preset resolution. But for perfectionist, it is very suffering.

Ok, here is a 3 steps method to solve this.

type “sudo gedit /etc/usplash.conf” in your terminal. After accessing with your root permission. You will see something like

# Usplash configuration file
# These parameters will only apply after running update-initramfs.
xres=640
yres=480

Just change the xres and yres to what your favourite resolution. Maybe 1024 x 768, then xres=1024, yres=768. After that, save it.

The last step, you need to type “sudo update-initramfs –u” to update your initramfs.

Reboot your PC and see whether you have a nice boot up GUI.