Erro ao actualizar para ubuntu 10.10

[Skullclamp]

Boas

Tenho instalado no pc o ubuntu 10.04 e hoje quando tentei actualizar para nova versão via gestor de actualizações dava o seguinte erro:

• W:Falhou obter http://archive.ubuntu.com/ubuntu/dists/maverick/Release  Unable to find expected entry  partner/source/Sources in Meta-index file (malformed Release file?)
  , W:Falhou obter http://security.ubuntu.com/ubuntu/dists/maverick-security/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  , W:Falhou obter http://archive.ubuntu.com/ubuntu/dists/maverick-updates/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  , W:Falhou obter http://archive.ubuntu.com/ubuntu/dists/maverick-security/Release  Unable to find expected entry  partner/source/Sources in Meta-index file (malformed Release file?)
  , W:Falhou obter http://archive.ubuntu.com/ubuntu/dists/maverick-proposed/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  , W:Falhou obter http://archive.ubuntu.com/ubuntu/dists/maverick-backports/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  , E:Falhou o download de alguns ficheiros de índice, foram ignorados ou os antigos foram usados em seu lugar.
  

Apos isso sacai o iso do cd e gravei-o, e no gestor de actualizações adicionei o cd de forma actualizar apartir dele mas tambem deu me um erro que era o segueinte:

• Falhou obter http://security.ubuntu.com/ubuntu/dists/lucid-security/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  Falhou obter http://archive.ubuntu.com/ubuntu/dists/lucid/Release  Unable to find expected entry  partner/source/Sources in Meta-index file (malformed Release file?)
  Falhou obter http://archive.ubuntu.com/ubuntu/dists/lucid-updates/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  Falhou obter http://archive.ubuntu.com/ubuntu/dists/lucid-security/Release  Unable to find expected entry  partner/source/Sources in Meta-index file (malformed Release file?)
  Falhou obter http://archive.ubuntu.com/ubuntu/dists/lucid-proposed/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  Falhou obter http://archive.ubuntu.com/ubuntu/dists/lucid-backports/Release  Unable to find expected entry  partner/binary-i386/Packages in Meta-index file (malformed Release file?)
  Falhou o download de alguns ficheiros de índice, foram ignorados ou os antigos foram usados em seu lugar.

Como resolver isto de forma a poder actualizar para nova versão do ubuntu?

Obrigado pela ajuda