Hi,

Are you sure that don't remember?

During install you see a page asking if you want to create a new user and a password for that user, and, if not, then root will be allowed to login. At this point you should have seen that page.

I read sometime in the ubuntuforums that you can actually login using as password "default" (without quote but I don't know if that is true.

However, if you can't login using 'root' as username and 'default' as password, you could restart the system, when the grub comes up, select the one that says Single User Mode, boot from there, you should access directly to the console without having to type any login, then add a new user, something like this:
Where user will be the name of your choice, if you have doubt about the questions of adduser, read the manpage (man adduser).

Then, you can give a password to that user using:
Again, change user for the name you like.



Regards