sudo apt-get update

PG: http://ppa.launchpad.net lucid Release Las firmas siguientes no se pudieron verificar porque su llave pública no está disponible: NO_PUBKEY 69755F70D8D6D0C4
W: Imposible obtener http://ppa.launchpad.net/centelles/ppa/ubuntu/dists/lucid/main/binary-i386/Packages.gz  404  Not Found

W: Imposible obtener http://ppa.launchpad.net/user/ppa-name/ubuntu/dists/lucid/main/binary-i386/Packages.gz  404  Not Found

E: Algunos archivos de índice no se han podido descargar, se han ignorado,
o se ha utilizado unos antiguos en su lugar.

# deb cdrom:[Kubuntu 10.04 LTS _Lucid Lynx_ - Release i386 (20100427)]/ lucid main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://es.archive.ubuntu.com/ubuntu/ lucid main restricted
deb-src http://es.archive.ubuntu.com/ubuntu/ lucid main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://es.archive.ubuntu.com/ubuntu/ lucid-updates main restricted
deb-src http://es.archive.ubuntu.com/ubuntu/ lucid-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://es.archive.ubuntu.com/ubuntu/ lucid universe
deb-src http://es.archive.ubuntu.com/ubuntu/ lucid universe
deb http://es.archive.ubuntu.com/ubuntu/ lucid-updates universe
deb-src http://es.archive.ubuntu.com/ubuntu/ lucid-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://es.archive.ubuntu.com/ubuntu/ lucid multiverse
deb-src http://es.archive.ubuntu.com/ubuntu/ lucid multiverse
deb http://es.archive.ubuntu.com/ubuntu/ lucid-updates multiverse
deb-src http://es.archive.ubuntu.com/ubuntu/ lucid-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://es.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
# deb-src http://es.archive.ubuntu.com/ubuntu/ lucid-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 lucid partner
# deb-src http://archive.canonical.com/ubuntu lucid partner

deb http://security.ubuntu.com/ubuntu lucid-security main restricted
deb-src http://security.ubuntu.com/ubuntu lucid-security main restricted
deb http://security.ubuntu.com/ubuntu lucid-security universe
deb-src http://security.ubuntu.com/ubuntu lucid-security universe
deb http://security.ubuntu.com/ubuntu lucid-security multiverse
deb-src http://security.ubuntu.com/ubuntu lucid-security multiverse
deb-src http://ppa.launchpad.net/jd-team/jdownloader/ubuntu lucid main

deb http://ppa.launchpad.net/centelles/ppa/ubuntu lucid main
deb http://ppa.launchpad.net/centelles/ppa/ubuntu lucid main
deb http://ppa.launchpad.net/jd-team/jdownloader/ubuntu lucid main
deb http://ppa.launchpad.net/jd-team/jdownloader/ubuntu lucid main
deb http://ppa.launchpad.net/lopeztobal/maths/ubuntu lucid main
deb http://ppa.launchpad.net/lopeztobal/maths/ubuntu lucid main

# This file makes sure that Opera Browser is kept up-to-date
# as part of regular system upgrades

deb http://deb.opera.com/opera/ stable non-free

# The line above will make sure you get all final public releases.
# Uncomment the following line if you want to get alpha and beta
# releases, too.

# deb http://deb.opera.com/opera-beta/ stable non-free

# This file makes sure that Opera Browser is kept up-to-date
# as part of regular system upgrades

deb http://deb.opera.com/opera/ stable non-free

# The line above will make sure you get all final public releases.
# Uncomment the following line if you want to get alpha and beta
# releases, too.

# deb http://deb.opera.com/opera-beta/ stable non-free

deb http://ppa.launchpad.net/user/ppa-name/ubuntu lucid main
deb http://ppa.launchpad.net/user/ppa-name/ubuntu lucid main