change the boot logo for 18.04 LTS [duplicate]

by default, the boot logo for Ubuntu 18.04 uses /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.png from the script /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.script

some of the content of this script is

    bits_per_pixel = Window.GetBitsPerPixel ();
if (bits_per_pixel == 4) {
    logo_filename = "ubuntu-logo16.png";
    progress_dot_off_filename = "progress-dot-off16.png";
    progress_dot_on_filename = "progress-dot-on16.png";
    password_field_filename = "password-field16.png";
    question_field_filename = "password-field16.png";
} else {
    logo_filename = "ubuntu-logo.png";
    progress_dot_off_filename = "progress-dot-off.png";
    progress_dot_on_filename = "progress-dot-on.png";
    password_field_filename = "password-field.png";
    question_field_filename = "password-field.png";

enter image description here

to change the boot logo by understanding above content of the script.. we need to replace ubuntu-logo16.png & ubuntu-logo.png files with our custome ones with same names..

you can easily do this with command line..

Example Command Line when my Custom Image is in ~/Downloads with boot.png name

cd /usr/share/plymouth/themes/ubuntu-logo
sudo mv ubuntu-logo.png ubuntu-logo.png.bak
sudo mv ubuntu-logo16.png ubuntu-logo16.png.bak
cd ~/Downloads
sudo cp boot.png /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.png
sudo cp boot.png /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo16.png

enter image description here

Recommendations for custom boot logo image:
image format: .png
image size: around 217px in width

change the boot logo for 18.04 LTS [duplicate]

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