Entendi, e embora me parecesse simples, não me senti seguro em alterar. Por favor, não pense que estou explorando a boa vontade, mas poderia indicar no código abaixo qual linha eu realmente devo alterar. Sou iniciante...(desculpe pelo pedido)
# 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
deb-src
http://archive.ubuntu.com/ubuntu natty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb
http://archive.ubuntu.com/ubuntu natty-updates main restricted
deb-src
http://archive.ubuntu.com/ubuntu natty-updates main restricted
## 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.
deb
http://archive.ubuntu.com/ubuntu natty universe
deb-src
http://archive.ubuntu.com/ubuntu natty universe
deb
http://pt.ptchive.ubuntu.com/ubuntu/ natty-updates universe
deb-src
http://archive.ubuntu.com/ubuntu natty-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://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
deb-src
http://archive.ubuntu.com/ubuntu natty-security main restricted
deb
http://archive.ubuntu.com/ubuntu natty-security universe
deb-src
http://archive.ubuntu.com/ubuntu natty-security 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://ppa.launchpad.net/mapopa/ppa/ubuntu maverick main
deb-src
http://ppa.launchpad.net/mapopa/ppa/ubuntu maverick main