Caros amigos.
Estou tendo esse erro de atualizaçao:
Falhou ao buscar http://ppa.launchpad.net/libreoffice/libreoffice-4-3/ubuntu/dists/trusty/main/source/Sources 404 Not Found
W: Falhou ao buscar http://ppa.launchpad.net/libreoffice/libreoffice-4-3/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
W: Falhou ao buscar http://ppa.launchpad.net/libreoffice/libreoffice-4-3/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found
Obrigado a quem puder me ajudar!