Configurar e instalar repositorios de Ubuntu

¿Qué es un repositorio?

Servidor o dispositivo donde encontramos almacenados los programas que incluye una distribución.

¿Para qué añadir nuevos repositorios?

Porque gracias a ellos tendremos acceso a más programas, actualizaciones y paquetes.

Añadiendo los repositorios extra

1. Abrir una terminal.

Menu Gnome > Aplicaciones > Accesorios > Terminal

2. Cambiar el usuario a root.

sudo su

3. Haremos un backup a la lista de repositorios.

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

4. Abrir la lista de repositorios con un editor de texto, por ejemplo gedit.

sudo gedit /etc/apt/sources.list

5. Buscar las siguientes lineas.

## Uncomment the following two lines to fetch updated software from the network
# deb http://us.archive.ubuntu.com/ubuntu breezy main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu breezy main restricted
 
## Uncomment the following two lines to fetch major bug fix updates produced
## after the final release of the distribution.
# deb http://us.archive.ubuntu.com/ubuntu breezy-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu breezy-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://us.archive.ubuntu.com/ubuntu breezy universe
 
# deb-src http://us.archive.ubuntu.com/ubuntu breezy universe
# deb http://security.ubuntu.com/ubuntu breezy-security main restricted
# deb-src http://security.ubuntu.com/ubuntu breezy-security main restricted
 
# deb http://security.ubuntu.com/ubuntu breezy-security universe
# deb-src http://security.ubuntu.com/ubuntu breezy-security
universe

6. Reemplazarlas con estas.

## Uncomment the following two lines to fetch updated software from
the network
deb http://us.archive.ubuntu.com/ubuntu breezy main restricted
deb-src http://us.archive.ubuntu.com/ubuntu breezy main restricted
 
## Uncomment the following two lines to fetch major bug fix updates
produced
## after the final release of the distribution.
deb http://us.archive.ubuntu.com/ubuntu breezy-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu breezy-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://us.archive.ubuntu.com/ubuntu breezy universe
deb-src http://us.archive.ubuntu.com/ubuntu breezy universe
 
deb http://security.ubuntu.com/ubuntu breezy-security main restricted
deb-src http://security.ubuntu.com/ubuntu breezy-security main restricted
 
deb http://security.ubuntu.com/ubuntu breezy-security universe
deb-src http://security.ubuntu.com/ubuntu breezy-security universe
 
deb http://archive.ubuntu.com/ubuntu breezy multiverse
deb-src http://archive.ubuntu.com/ubuntu breezy multiverse
 
## Extras
deb http://ubuntu-backports.mirrormax.net/ breezy-extras main
restricted universe multiverse
 
## Backports
deb http://archive.ubuntu.com/ubuntu breezy-backports main restricted
universe multiverse

7. Guardar el archivo editado. (CTRL + S)

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