Comment 7 for bug 784128

ciao ho scritto nel terminale sudo rm /var/lib/apt/lists/* -vf
e mi dice

removed `/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_natty_partner_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_natty_partner_source_Sources'
removed `/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_natty_Release'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_main_i18n_Translation-it'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_multiverse_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_multiverse_i18n_Translation-it'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_multiverse_source_Sources'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_Release'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_Release.gpg'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_restricted_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_restricted_i18n_Translation-it'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_restricted_source_Sources'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_main_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_main_source_Sources'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_multiverse_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_multiverse_source_Sources'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_Release'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_Release.gpg'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_restricted_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_restricted_source_Sources'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_universe_binary-i386_Packages'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-security_universe_source_Sources'
removed `/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_universe_i18n_Translation-it'
removed `/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages'
removed `/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_natty_main_source_Sources'
removed `/var/lib/apt/lists/lock'
rm: cannot remove `/var/lib/apt/lists/partial': Is a directory
------------
poi con sudo apt-get update

W: Errore GPG: http://extras.ubuntu.com natty Release: Le seguenti firme non erano valide: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <email address hidden>
W: Impossibile recuperare gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_natty_main_source_Sources Somma hash non corrispondente

W: Impossibile recuperare gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_natty_universe_source_Sources Somma hash non corrispondente

W: Impossibile recuperare gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages Somma hash non corrispondente

W: Impossibile recuperare gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_natty_universe_binary-i386_Packages Somma hash non corrispondente

E: Some index files failed to download. They have been ignored, or old ones used instead.

-----------
con update manager mi da stesso errore

Could not initialize the package information

An unresolvable problem occurred while initializing the package information.

Please report this bug against the 'update-manager' package and include the following error message:

'E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_main_i18n_Translation-it, E:L'elenco dei pacchetti o il file di stato non può essere letto o aperto.'