Default password for geoserver 2.1.4 not working

I have installed geoserver 2.1.4 on Ubuntu 10.04 i have jetty running on port 90.

I get to the login screen. I introduce user: admin password: geoserver and i am getting that user or passowrd are not correct!!

It is supposed that those are default user and pass. Can i change it on a file or something?

Maybe geoserver is not properly installed?

Regards,