Falha ao baixar informações do repositório - Verificar sua conexão com a Internet [RESOLVIDO]

Todas as vezes que eu tento verificar uma atualização no gerenciador de atualizações aparece o seguinte erro, o que fazer ?


Falha ao baixar informações do repositório

Verificar sua conexão com a Internet


W:Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/source/Sources 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/gdm2setup/gdm2setup/ubuntu/dists/precise/main/source/Sources 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/gdm2setup/gdm2setup/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.

# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restrictedhttp://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/source/

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

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

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

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

Esses endereços de ppa estão indisponíveis pelo visto, então conviva com isso ou desabilite-os deletados seus arquivos em:

/etc/apt/sources.list.d/

Entre nele:

cd /etc/apt/sources.list.d/

E apague eles:

sudo rm nomedoarquivo

* o arquivo vai está com o nome próximo a sua referência do ppa ...claudiocn... e ...gdm2setup...

Not Found

The requested URL /gdm2setup/gdm2setup/ubuntu/dists/precise/main/binary-i386/Packages was not found on this server.
Apache/2.2.14 (Ubuntu) Server at ppa.launchpad.net Port 80

Bom, eu entendi que esses arquivos não existem mais, e por isso a única coisa que eu podia fazer era remove-los, porém o que eu perco com isso ? Qual era a função disso ?

O objetivo deles é apontar para endereços na internet onde existem alguns softwares adicionais, mais por algum motivo o endereço foi trocado ou não é mantido mais...

NO MEU DA ESSE ERROR Falha ao baixar informações do repositório MAIS QUANDO EU COLOCO ESSE CODIGO APARECER ISSO Falhou o download de alguns ficheiros de índice. Foram ignorados ou os antigos foram usados em seu lugar.
ubuntu@ubuntu:~$ s
MAIS QUANDO EU VOU INSTALLA O PROGRAMA DA ESSE ERRO Falha ao baixar informações do repositório Verificar sua conexão com a Internet. E APARECER PAEA EU APERT OK