so my school had me try to disable root login by editing /etc/passwd file, root:x:0:0:root:/root:/sbin/nologin
the plan is to have me use sudo commands to then revert this change. but since doing this change, sudo commands when used asks for password of the non sudo user im logged into and then proceed to give me a error saying the username is not in sudoers file. how do i fix this?