- To disable GDM/KDM/etc, edit /etc/default/grub and change the line GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="text"
- To show boot messages and disable the splash image, remove quiet splash from GRUB_CMDLINE_LINUX_DEFAULT so that it reads GRUB_CMDLINE_LINUX_DEFAULT="". (If you want the splash image and some text, use splash.)
- Run sudo update-grub
Done!
