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Intro

zsync is a usefull progam to download the parts of a file that are changed on the server, so you haven't to download everytime a full copy of Ubuntu but simply update it.

zsync will also provvide to make the checksum comparison and made possible the change of flavor (e.g. you have an ISO of Ubuntu and want to change it on kubuntu, simply copy/paste the right line for Kubuntu and it will download only the files that differs from the two versions).

Installing zsync

Install [apt://zsync zsync] package.

Acquiring the ISO

All Ubuntu's CD images are stored on the http://cdimage.ubuntu.com site. The fastest way to download is by [http://en.wikipedia.org/wiki/BitTorrent_(software): Torrent]. If you have a local Ubuntu archive mirror or cache, you can also use Jigdo, zsync is handy for finishing up Jigdo downloads that still have a few missing pieces.

Updating the ISO

To update your ISO image, open a Terminal, go to the directory where you have saved the image and copy/paste the appropriate from the following commands.

** Computer with 32 bit (i386) architecture

UBUNTU

zsync http://cdimage.ubuntu.com/daily-live/current/lucid-desktop-i386.iso.zsync

KUBUNTU

zsync http://cdimage.ubuntu.com/kubuntu/daily-live/current/lucid-desktop-i386.iso.zsync

XUBUNTU

zsync http://cdimage.ubuntu.com/xubuntu/daily-live/current/lucid-desktop-i386.iso.zsync

** Computer with 64 bit (amd64 or multicore) architecture

UBUNTU

zsync http://cdimage.ubuntu.com/daily-live/current/lucid-desktop-amd64.iso.zsync

KUBUNTU

zsync http://cdimage.ubuntu.com/kubuntu/daily-live/current/lucid-desktop-amd64.iso.zsync

XUBUNTU

zsync http://cdimage.ubuntu.com/xubuntu/daily-live/current/lucid-desktop-amd64.iso.zsync

Updating with rsync instead

Another way to update your ISO is by rsync. It use the same algorithm of zsync but as it require special software on the server end it is a little bit less efficient than zsync. A number of the Ubuntu servers also work as rsync servers with quite similar URIs to the websites. For example:

rsync -zhhP rsync://cdimage.ubuntu.com/cdimage/daily-live/current/lucid-desktop-i386.iso .

will sync the server's daily Lucid desktop image (for i386) to your local system with an older desktop image already stored on your hard drive. -z is compression, -hh is human readable file size (in KB or MB), and -P is a progress indicator.

Note: If you are using other flavors of Ubuntu don't forget to add the flavor's name in the rsync path after cdimage/, e.g.

rsync -zhhP rsync://cdimage.ubuntu.com/cdimage/kubuntu/daily-live/current/lucid-desktop-i386.iso .

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