UBUNTU is stuck at the loading menu when I rebooted after disabling the display manager using the command:
sudo systemctl disable display-manager.service
I used the answer here to disable the display-manager: https://superuser.com/questions/1088054/how-to-boot-to-command-line-interface-in-ubuntu-16-04
Now the answer suggests that if you run into any trouble, add nomodeset into your kernel parameters. When I press escape for GRUB at boot, I get GRUB shell. How do I add nomodeset to the kernel parameters from GRUB shell?