What happened to the su password, please?
No passwords, including blank, works.
Also, how do you log in as the administrator?
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Nothing has happened to su. su [<username>] has always required you to know the password of the account you're trying to access. If you don't provide a username, it assumes you know the root account password.
And Ubuntu hasn't set root passwords for years.
If you're in the sudo/admin group, and can run sudo (which is what you might be confused with) you can run:
sudo -i
When prompted, you should enter your password.
I'd thoroughly discourage you from setting a root password. While that would technically allow you to su, root doesn't have a password for a reason (to stop things brute forcing it directly) so you'd be undoing that for no good reason.
Oli
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