changing download server for install - 11.04

Hi all. I am trying to install 11.04 but the server from which the installation program downloads from is having some issue and is *extremely* slow (i have been checking this for four days...). Are there any way to change this server? I have already used the "try ubuntu" option and changed the server in synaptic, but it doesn't seem to work.

tks for any help.

You can try one of the official Ubuntu download mirrors

https://launchpad.net/ubuntu/+cdmirrors

Thanks 2F4U.
It seems that the brazilian server had a temporary problem and is up and running now: my ubuntu is installed and working goog.

Thanks for your reply.