Change Ubuntu grub background colour

sudo -H gedit /usr/share/plymouth/themes/default.grub

And change the grub background colour as you want with RGBA code, in my case I change grub background to gray (128,128,128,0)

if background_color 128,128,128,0; then
  clear
fi

Then, update grub

sudo update-grub2

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Kawin Viriyaprasopsook

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