I had enabled root login before and tried to change its password using this guide. But after successfully changing the password and locking it via
sudo passwd -dl root. I cannot login back to SSH, it says Access is denied.
I have two users on my machine. root and admin, admin does not have su permission. When I try to use
sudo on admin user, it says that admin is not in the sudoers file. That is why i need my su user back.