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sudo apt update
sudo apt install plymouth-themes 


sudo nano /etc/default/grub 

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

sudo update-alternatives --config default.plymouth

sudo update-initramfs -u

sudo update-grub

sudo mkdir -p /usr/share/plymouth/themes/knoppix-tux

---

1. sudo nano /usr/share/plymouth/themes/knoppix-tux/knoppix-tux.plymouth
   

   
   

   
   

ini

[Plymouth Theme]
Name=Knoppix Tux Center
Description=A custom boot screen featuring a centered Tux penguin.
ModuleName=script

[script]
ImageDir=/usr/share/plymouth/themes/knoppix-tux
ScriptFile=/usr/share/plymouth/themes/knoppix-tux/knoppix-tux.script

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1. sudo nano /usr/share/plymouth/themes/knoppix-tux/knoppix-tux.script
   

   :
2. graphic

   # Load the Tux image
   tux_image = Image("tux.png");
   tux_sprite = Sprite(tux_image);
   
   # Calculate the exact center of the screen
   screen_width = Window.GetWidth();
   screen_height = Window.GetHeight();
   
   image_width = tux_image.GetWidth();
   image_height = tux_image.GetHeight();
   
   # Math to center the sprite
   tux_x = (screen_width / 2) - (image_width / 2);
   tux_y = (screen_height / 2) - (image_height / 2);
   
   # Apply the coordinates and make it visible
   tux_sprite.SetX(tux_x);
   tux_sprite.SetY(tux_y);
   tux_sprite.SetOpacity(1.0);
   

   
   

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sudo cp ~/Downloads/tux.png /usr/share/plymouth/themes/knoppix-tux/

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Register and Activate the Theme

1. sudo update-alternatives --install /usr/share/plymouth/themes/default.plymouth default.plymouth /usr/share/plymouth/themes/knoppix-tux/knoppix-tux.plymouth 100
   

   
   
2. 
   
3. 
   
4. Select the theme:
5. sudo update-alternatives --config default.plymouth
   
   
   Look at the terminal output. Type the number corresponding to your new knoppix-tux theme and hit Enter.

1. Verify GRUB Settings:
   Ensure the default graphical arguments are restored. Open your GRUB file:
   bash

   sudo nano /etc/default/grub
   

   
   
   Make sure this line contains both quiet and splash:
   bash

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
   

   
   
   

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Build the Changes Into the System

Because Plymouth runs before your actual operating system files mount, you must bake this theme into the system's temporary boot image (initramfs).

Run these final commands to compile the theme and update the boot menu:

sudo update-initramfs -u
sudo update-grub

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Test it Without Rebooting (Optional)

sudo plymouthd; sudo plymouth --show-splash; sleep 5; sudo plymouth quit

Note: If this command opens a black window, it is usually because the plymouthd daemon is already running or your display server is blocking it. Don't worry—the ultimate test is a quick system reboot:

 reboot

The Result

When Zorin OS 18 boots up, your modern layout will disappear, and a beautifully centered, high-resolution Tux penguin will sit right in the middle of your display until the desktop login screen loads!