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 version (e.g. you have an ISO of Ubuntu and want to change it on kubuntu, simply copy/paste the line for Kubuntu and it will download only the files that differs from the two versions).

Installing zsync

Install [apt://zsync zsync] package.

Obtain Ubuntu

All Ubuntu's CD images are stored on the http://cdimage.ubuntu.com site. The first time download fastest way is by [http://en.wikipedia.org/wiki/BitTorrent_(software): Torrent].

Update ISO

To update your ISO image, open a Terminal, go to the directory whee 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