postfix failed to install under ubuntu

[Peter]

--- On Thu, 1/1/09, Iain Young <iain at g7iii.net> wrote:

> From: Iain Young <iain at g7iii.net>
> Subject: Re: postfix failed to install under ubuntu
> To: pcpc168 at sbcglobal.net, "Ubuntu user technical support, not for general discussions" <ubuntu-users at lists.ubuntu.com>
> Date: Thursday, January 1, 2009, 3:03 PM
> You need to run "apt-get update"
> 

I got lots of 403 error when run the above command, similar as install postfix.

I think my 6.1 version is too old, is there a way that I can update my OS to the latest 8.1 if I have no physical access to the machine?

Thanks.

Peter