this is great, thanks a lot.

but try to install to n810

the repository have many packages missing.

something like
Err http://ports.ubuntu.com jaunty/main python-support 0.8.7ubuntu2
404 Not Found

and http://ports.ubuntu.com is very slow.

debian arm and x86 repository share same web site and every site have all packages for different architecture.
but ubuntu seems different, only http://ports.ubuntu.com for ARM platform.