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Note: It might not work on UEFI installs.

sudo apt-get install v86d
sudo -H mousepad /etc/default/grub
In text editor find this line: #GRUB_GFXMODE=640x480 and change it to GRUB_GFXMODE=1440x900 (enter your screen resolution, be sure to remove #)
Then add this line below GRUB_GFXPAYLOAD_LINUX=keep (not needed on Xubuntu 18.04)
Save file and close Mousepad.
echo FRAMEBUFFER=y | sudo tee /etc/initramfs-tools/conf.d/splash (not needed on Xubuntu 18.04)
sudo update-initramfs -u (not needed on Xubuntu 18.04)
sudo update-grub