If you absolutely don’t want the graphical login screen, edit
/etc/defaults/grub
, Changing GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX to “text”. Then run
update-grub
.
This question has more information on how to remove the graphical splash screen too:
How do I boot into true text mode?
Basically it stops the display manager (lightdm) from loading on system startup.
Also, you can still launch it any time you want manually by doing
sudo service lightdm start