For those who have experienced an ugly Plymouth screen when booting into Ubuntu, there are plenty of fixes and scripts out there that are proven to fix the resolution but there are a few who still struggle with fixing it.
The following procedure will help you to fix the ugly resolution by editing GRUB and BURG, yes BURG affects the Plymouth as well.
First, open terminal then input:
sudo apt-get install v86d hwinfo
After the installation run in terminal:
sudo hwinfo --framebuffer
*take note of the highest resolution that your display can support when running Plymouth.
Still in terminal:
gksu gedit /etc/default/grub
*this will bring up the text editor for GRUB configuration.
On the text editor find the line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset video=uvesafb:mode_option=1024x768-24,mtrr=3,scroll=ywrap"
then find the line that says:
and change it into:
save and exit.
*replace the resolution with the highest resolution that your display supports as listed in hwinfo --framebuffer.
Still in terminal input:
gksu gedit /etc/initramfs-tools/modules
*this will again bring you a text editor.
Scroll to the end of the page and insert:
uvesafb mode_option=1024x768-24 mtrr=3 scroll=ywrap
save and exit.
Type in terminal:
echo FRAMEBUFFER=y | sudo tee /etc/initramfs-tools/conf.d/splash
sudo update-initramfs -u
This will fix the resolution when you have GRUB.
To fix the resolution when you are using BURG, just do the above steps again but replacing grub with burg. This will fix the Plymouth when you have BURG installed as your boot menu.