Published at LXer:

Ubuntu 11.04 is finally here and you can’t wait to download it, but as is typical on any Ubuntu release day, the mirrors are crawling. Luckily if you have an old Ubuntu .iso you can update it easily with zsync. Zsync is a Linux command that allows you to compare an existing .iso with an up-to-date zsync meta file to download only the missing or out of date parts. Combine those parts with your existing file and what you are left with is a completely up to date iso without spending the time to download the entire file.

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