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== Installation media ==

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=== CD/DVD Images (ISOs) ===

An automated system builds CD and DVD images based on the packages in the archive.  Its log files are available from [[http://people.ubuntu.com/~ubuntu-archive/cd-build-logs/]], and the set of packages included on them is driven by the [[SeedManagement|seeds]].

New builds are usually produced on a daily basis and published at [[http://cdimage.ubuntu.com/|cdimage.ubuntu.com]].  Officially released images are published at [[http://releases.ubuntu.com/|releases.ubuntu.com]].  Both are available via HTTP, [[RsyncCdImage|rsync]] and BitTorrent.

If you test a CD image, be sure to [[Testing/ReportingResults|report your results]] to the development team.

There are two main varieties of images.  One type primarily contains packages, and uses the [[#DebianInstaller|"alternate" installer]] (e.g., the server ISO and the alternate ISO).  The other contains a casper filesystem and uses the [[#Ubiquity|Ubiquity installer]] (e.g., the desktop ISO)

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=== Installers ===

Further details regarding installer development, including source code access, can be found on the InstallerDevelopment page.

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==== Ubiquity ====

Ubiquity is a graphical installation program which, simply speaking, copies a pre-installed ("live") Ubuntu system and reconfigures it for the system's hardware.  It is designed to handle common installation scenarios quickly and easily.  Details can be found in the [[http://bazaar.launchpad.net/~ubuntu-installer/ubiquity/trunk/annotate?file_id=README-20051205083553-550dab3cb68ad622|Ubiquity README]].

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==== Alternate (Debian) Installer ====

The Debian installer builds up the installed system from scratch using `.deb` packages.  It is designed for flexibility, and supports more complex installation scenarios.  A good overview can be found in the [[http://d-i.alioth.debian.org/doc/talks/debconf6/paper/|debian-installer paper from DebConf 6]].

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