How to Select the Fastest Mirror for Your Ubuntu 9.10 (Karmic) Upgrade

Use the following procedure tutorial to select the fastest ubuntu mirror near to your location.

Procedure to Follow
First you need to launch Synaptic package manager from  System > Administration > Synaptic Package Manager
Now go to select Settings -> Repositories.

Select Ubuntu Software tab In the Download From drop down, choose Other…

Click the Select Best Server button in the resulting dialog.Wait a minute (or perhaps more on a slow connection).

Testing best server is in progress

Once it’s finished,click on choose server

close everything and click Reload in the main Synaptic window.

Downloading package information in progress from your new mirror

This simple procedure picks the best mirror for you. This works for me very well so i would suggest you try this and see if it works for you or not.
If you have any other method which worked for you please let us know.