Today is release day for Karmic Koala. That usually means that there is a lot of I’net traffic. Ubuntu tutorials has a description about how you can use zsync to update CD image files.
The download mirrors for this release have started to include .zsync files. zsync is similar to rsync, but it puts the load on the client vs the server, and it allows you to update your existing images in a fraction of the time it would take to re-download the full image.
The tutorial appears to be missing the zsync command on the first line of its examples. The process is first to install zsync and make sure your pre-release iso files have the release name. Then you run zsync against the proper server iso.zsync file to update the iso to the latest version
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