I know this is unusual... I accidentally damaged the
default.plymouth file, which is located at
/usr/share/plymouth/themes, because of desperate pursue of changing my boot screen into a macOS boot screen display. As a result, my boot screen has no more boot screen display. When it starts, it's all blank; when shuts down, it shows codes.
Please, can anyone help me with this... I just want to have an aesthetic boot screen.