Configuration of the Advanced Packaging Tool (APT) system repositories is stored in the /etc/apt/sources.list configuration file. An example of this file is referenced here, along with information on adding or removing repository references from the file.
Here is a simple example of a typical /etc/apt/sources.list file.
You may edit the file to enable repositories or disable them. For example, to disable the requirement of inserting the Ubuntu CD-ROM whenever package operations occur, simply comment out the appropriate line for the CD-ROM, which appears at the top of the file:
# no more prompting for CD-ROM please
# deb cdrom:[Ubuntu 8.10_Intrepid_Ibex - Release i386 (20070419.1)]/ intrepid main restricted
In addition to the officially supported package repositories available for Ubuntu, there exist additional community-maintained repositories which add thousands more potential packages for installation. Two of the most popular are the Universe and Multiverse repositories. These repositories are not officially supported by Ubuntu, but because they are maintained by the community they generally provide packages which are safe for use with your Ubuntu computer.
![[Note]](../../libs/admon/note.png)
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Packages in the Multiverse repository often have licensing issues that prevent them from being distributed with a free operating system, and they may be illegal in your locality. |
![[Warning]](../../libs/admon/warning.png)
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Be advised that neither the Universe or Multiverse repositories contain officially supported packages. In particular, there may not be security updates for these packages. |
Many other package sources are available, sometimes even offering only one package, as in the case of package sources provided by the developer of a single application. You should always be very careful and cautious when using non-standard package sources, however. Research the source and packages carefully before performing any installation, as some package sources and their packages could render your system unstable or non-functional in some respects.
By default, the Universe and
Multiverse repositories are enabled but if
you would like to disable them edit /etc/apt/sources.list
and comment the following lines:
deb http://archive.ubuntu.com/ubuntu intrepid universe multiverse
deb-src http://archive.ubuntu.com/ubuntu intrepid universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ intrepid universe
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid universe
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates universe
deb http://us.archive.ubuntu.com/ubuntu/ intrepid multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid multiverse
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates multiverse
deb http://security.ubuntu.com/ubuntu intrepid-security universe
deb-src http://security.ubuntu.com/ubuntu intrepid-security universe
deb http://security.ubuntu.com/ubuntu intrepid-security multiverse
deb-src http://security.ubuntu.com/ubuntu intrepid-security multiverse
