Hit Ctrl+Alt+F1. This will bring to a separate terminal. Try to login as root by typing root as your login and providing the password. If the root account is enabled, the login will work.

How do I know if my root is enabled?

Hit Ctrl+Alt+F1. This will bring to a separate terminal. Try to login as root by typing root as your login and providing the password. If the root account is enabled, the login will work.

Can the root account be disabled?

The simplest method to disable root user login is to change its shell from /bin/bash or /bin/bash (or any other shell that permits user login) to /sbin/nologin , in the /etc/passwd file, which you can open for editing using any of your favorite command line editors as shown. Save the file and close it.