Boot Splash Screen (Linux)

Installing plymouth and plymouth-themes with Administration Privilege

Editing /etc/initramfs-tools/modules Based on GPU System with Administration Privilege to:

# KMS [INTEL]

intel_agp

drm

i915 modeset=1

# KMS [NVIDIA]

drm

nouveau modeset=1

# KMS [AMD]

drm

radeon modeset=1

Editing /etc/default/grub with Administration Privilege to:

GRUB_TIMEOUT=3
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo ParsEnterprise`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_GFXMODE=1024x768x32 or widthxheightxdepth
GRUB_DISABLE_OS_PROBER=true
export GRUB_MENU_PICTURE="/home/username/.parsenterprise/Bootloader.png"
export GRUB_COLOR_NORMAL="light-gray/black"
export GRUB_COLOR_HIGHLIGHT="yellow/black"

Then Performing: sudo update-grub

Displaying All Installed Themes Run with Administration Privilege

#sudo plymouth-set-default-theme -l

Then, to Set Your Desired Theme Run with Administration Privilege

#plymouth-set-default-theme -R text

And Editing Grub Boot Entries via Grub Customizer Application