/etc/apt/sources.list

O ficheiro sources.list guarda uma lista de endereços a partir dos quais o computador se actualiza ou instala novas aplicações. A instalação de novas aplicações pode ser realizada a partir do modo gráfico com o Synaptic ou em modo texto com o comando apt‑get.

Para editar o ficheiro sources.list deverá ter permissões de administrador e introduzir na consola:

$ sudo gedit /etc/apt/sources.list

Nota: As linhas começadas pelos caracteres # ou ## são comentários. Servem para orientar as pessoas que lêm o ficheiro com um editor de texto. O sistema operativo ignora estas linhas. Devido a este facto também é habitual usar o caracter # para comentar/descomentar linhas e com isso desactivar/activar fontes de software.

Exemplo de um ficheiro sources list para Portugal para o Edgy Eft

Exemplo para computadores com processadores compatíveis com Intel 386, versão Edgy Eft (6.10) do Ubuntu.

deb http://pt.archive.ubuntu.com/ubuntu/ edgy main restricted universe multiverse
deb‑src http://pt.archive.ubuntu.com/ubuntu/ edgy main restricted universe multiverse

## Major bug fix updates produced after the final release of the
## distribution.
deb http://pt.archive.ubuntu.com/ubuntu/ edgy‑updates main restricted universe multiverse
deb‑src http://pt.archive.ubuntu.com/ubuntu/ edgy‑updates main restricted universe multiverse

## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
# deb http://pt.archive.ubuntu.com/ubuntu/ edgy universe
# deb‑src http://pt.archive.ubuntu.com/ubuntu/ edgy universe

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://pt.archive.ubuntu.com/ubuntu/ edgy‑backports main restricted universe multiverse
# deb‑src http://pt.archive.ubuntu.com/ubuntu/ edgy‑backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu edgy‑security main restricted universe multiverse
deb‑src http://security.ubuntu.com/ubuntu edgy‑security main restricted universe multiverse
# deb http://security.ubuntu.com/ubuntu edgy‑security universe
deb http://archive.ubuntu.com/ubuntu/ edgy‑proposed restricted main multiverse universe
deb‑src http://archive.ubuntu.com/ubuntu/ edgy‑proposed restricted main multiverse universe
# deb‑src http://security.ubuntu.com/ubuntu edgy‑security universe
deb http://www.getautomatix.com/apt edgy main

#AUTOMATIX REPOS START

deb http://dl.google.com/linux/deb/ stable non‑free

deb http://archive.canonical.com/ubuntu dapper‑commercial main

deb http://archive.ubuntu.com/ubuntu edgy‑backports main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu edgy‑updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu edgy‑security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu edgy main restricted universe multiverse
#AUTOMATIX REPOS END

Exemplo de um ficheiro sources list para Portugal para o Dapper Drake

Exemplo para computadores com processadores compatíveis com Intel 386, versão Dapper Drake (6.06) do Ubuntu.

Pacotes base:

deb‑src http://pt.archive.ubuntu.com/ubuntu/ dapper main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://pt.archive.ubuntu.com/ubuntu/ dapper‑updates main restricted
deb‑src http://pt.archive.ubuntu.com/ubuntu/ dapper‑updates main restricted

## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://archive.ubuntu.com/ubuntu/ dapper universe main restricted multiverse
deb‑src http://pt.archive.ubuntu.com/ubuntu/ dapper universe

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://pt.archive.ubuntu.com/ubuntu/ dapper‑backports main restricted universe multiverse
# deb‑src http://pt.archive.ubuntu.com/ubuntu/ dapper‑backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu dapper‑security main restricted
deb‑src http://security.ubuntu.com/ubuntu dapper‑security main restricted
# deb http://security.ubuntu.com/ubuntu dapper‑security universe
# deb‑src http://security.ubuntu.com/ubuntu dapper‑security universe

Caso esteja num ambiente de experimentação, onde a estabilidade do sistema não é tão importante pode experimentar adicionar as seguintes linhas no final do dicheiro sources.list

# Automatically generated sources.list
# http://www.ubuntulinux.nl/source‑o‑matic
#
# If you get errors about missing keys, lookup the key in this file
# and run these commands (replace KEY with the key number)
#
# gpg ‑‑keyserver subkeys.pgp.net ‑‑recv KEY
# gpg ‑‑export ‑‑armor KEY | sudo apt‑key add · # Cipherfunk multimedia packages (packages, GPG key: 33BAC1B3)
deb ftp://cipherfunk.org/pub/packages/ubuntu/ dapper main

Source‑o‑matic

O sítio Source‑o‑matic apresenta um script para gerar ficheiros "sources.list".