Article : change_splashscreen_in_Ubuntu

Changeing the login Screen


#sudo mv ~/your-wallpaper-name.jpg /usr/share/backgrounds
#sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow
#sudo unlink /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop

Chaning the Boot Splashscreen


#sudo apt-get install plymouth-theme-*
#sudo update-alternatives --config default.plymouth
choose your theme
#sudo update-initramfs -u