W: Duplicate sources.list entry http://archive.ubuntu.com/ubuntu/ quantal/restricted i386 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_quantal_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://archive.ubuntu.com/ubuntu/ quantal-updates/restricted i386 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_quantal-updates_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://archive.ubuntu.com/ubuntu/ quantal-backports/restricted i386 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_quantal-backports_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://archive.ubuntu.com/ubuntu/ quantal-backports/multiverse i386 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_quantal-backports_multiverse_binary-i386_Packages)
W: Duplicate sources.list entry http://archive.ubuntu.com/ubuntu/ quantal-security/restricted i386 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_quantal-security_restricted_binary-i386_Packages)
W: È consigliato eseguire "apt-get update" per correggere questi problemi