From today we have the final version of Ubuntu Karmic Koala 910. If you want to download the ISO to burn a CD you can do from this here . Best option is to use torrents to download the ISO from the p2p network. The torrent you have them here:

All you have option to download at: http://releases.ubuntu.com/9.10/

If on the other hand, you prefer to update the system, you can follow the instructions as detailed in their day here in ubuntux.info

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