Erro ao tentar atualizar lista

[nlsouza]

Colegas, tentei instalar o virtualbox no ubuntu 11.04 e quando dou um comando para atualizar aparece a mensagem:

Código Selecionar Expandir


root@nilo-leptop:/# apt-get update
E: Tipo '"deb' não é conhecido na linha 1 na lista de fontes /etc/apt/sources.list.d/virtualbox.list
E: A lista de fontes não pode ser lida.


Meu source list

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# deb cdrom:[Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)]/ natty main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu natty main restricted universe
deb-src http://archive.ubuntu.com/ubuntu natty main restricted universe

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

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.

## 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://archive.ubuntu.com/ubuntu natty multiverse
deb-src http://archive.ubuntu.com/ubuntu natty multiverse
deb http://archive.ubuntu.com/ubuntu natty-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu natty-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://br.archive.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse
# deb-src http://br.archive.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu natty-security main restricted universe
deb-src http://archive.ubuntu.com/ubuntu natty-security main restricted universe
deb http://archive.ubuntu.com/ubuntu natty-security multiverse
deb-src http://archive.ubuntu.com/ubuntu natty-security 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 natty partner
# deb-src http://archive.canonical.com/ubuntu natty partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
## deb http://extras.ubuntu.com/ubuntu natty main
## deb-src http://extras.ubuntu.com/ubuntu natty main
## deb http://download.tuxfamily.org/glxdock/repository/ubuntu natty cairo-dock
## deb http://download.tuxfamily.org/glxdock/repository/ubuntu natty cairo-dock


O que devo fazer?
Obrigado!

[Creto]

Synaptic>Configuração>Repositórios>Outros Software>Remover de lá tudo o que fizer referência a isso

E: Tipo '"deb' não é conhecido na linha 1 na lista de fontes /etc/apt/sources.list.d/virtualbox.list
E: A lista de fontes não pode ser lida.