Removing/hiding all boot screens
to achieve the requirements in the Question for default Ubuntu 18.04
need to edit the below files:
- for changing grub color:
/usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.grub - for plymouth color:
/usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.script - for login-screen background color:
/usr/share/gnome-shell/theme/ubuntu.css
ubuntu-logo.grub my file content. replace the values to 0,0,0,0; for black
if background_color 66,48,228,0.5; then
clear
fi
ubuntu-logo.script some of my file content. replace the values to (0, 0, 0); for black
Window.SetBackgroundTopColor (0.16, 0.00, 0.12); # Nice colour on top of the screen fading to
Window.SetBackgroundBottomColor (0, 1.02, 1.02); # an equally nice colour on the bottom
ubuntu.css my file edited content at around line number 1814
#lockDialogGroup {
background-color: #000000; }
after editing the files, save & close all files..
then run sudo update-grub
Reboot to see the change.