Updating packages lists
W: Impossibile recuperare http://ppa.launchpad.net/libreoffice/libreoffice-4-3/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found

W: Impossibile recuperare http://ppa.launchpad.net/libreoffice/libreoffice-4-3/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

E: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.
Warning:  apt-get update failed for some reason
PPA to be removed: ppa ppa
Warning:  Could not find package list for PPA: ppa ppa