Error de fuentes /etc/apt/sources.list

[yecho]

Amigos

Denme una manito. Soy nuevo en Ubunto y en Synaptic me aparece el siguiente error

E: Tipo '$' desconocido en la línea 50 de lista de fuentes /etc/apt/sources.list
E: No se pudo leer la lista de fuentes.
Vaya al diálogo del repositorio para corregir el problema.
E: _cache->open() failed, please report.

Cuando voy a /etc/apt/sources.list. aparece lo siguiente>

# deb cdrom:[Ubuntu 8.04.1 _Hardy Heron_ - Release i386 (20080702.1)]/ hardy main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://ubuntu.utalca.cl/ hardy restricted main

## Major bug fix updates produced after the final release of the
## distribution.
deb http://ubuntu.utalca.cl/ hardy-updates restricted main

## 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://ubuntu.utalca.cl/ hardy universe
deb http://ubuntu.utalca.cl/ hardy-updates universe

## 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
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ubuntu.utalca.cl/ hardy multiverse
deb http://ubuntu.utalca.cl/ hardy-updates multiverse

## 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://cl.archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse
# deb-src http://cl.archive.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository. This software is not part of Ubuntu, but is
## offered by Canonical and the respective vendors as a service to Ubuntu
## users.
deb http://archive.canonical.com/ubuntu hardy partner
# deb-src http://archive.canonical.com/ubuntu hardy partner

deb http://ubuntu.utalca.cl/ hardy-security restricted main
deb http://ubuntu.utalca.cl/ hardy-security universe
deb http://ubuntu.utalca.cl/ hardy-security multiverse
## gnome-do
deb http://ppa.launchpad.net/rharding/ubuntu gutsy main
deb-src http://ppa.launchpad.net/rharding/ubuntu gutsy main
$ sudo aptitude update

deb cdrom:[Ubuntu 8.04.1 _Hardy Heron_ - Release i386 (20080702.1)]/ hardy main restricted
sudo gedit /etc/apt/sources.list
sudo mv /etc/apt/sources.list.d/medibuntu.list /etc/apt/sources.list.d/medibuntu.list-old
sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list
sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update

Llevo muchas horas tratando de arreglar el problema y mirando los foros.
Gracias de antemano.
Yecho