non sono in grado di farlo ora; grazie per i consigli e la disponibilità,
spero quanto prima di poter riparare il programma secondo le vostre precise
istruzioni.
Ancora molti ringraziamenti... :-)



2013/10/17 Vladimir Plotnikov <email address hidden>

> same problem on dist-upgrade from 13.04 to 13.10
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1095148).
> https://bugs.launchpad.net/bugs/346386
>
> Title:
>   [MASTER] Update fails with invalid package files with "Encountered a
>   section with no Package: header"
>
> Status in “apt” package in Ubuntu:
>   Fix Released
> Status in “apt” source package in Natty:
>   Fix Released
> Status in “apt” source package in Precise:
>   Fix Released
> Status in “apt” package in Debian:
>   Fix Released
>
> Bug description:
>   Binary package hint: adept-updater
>
>   Pertinent data printed when attempting to run Updater as follows:
>
>   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/us.archive.ubuntu
>   .com_ubuntu_dists_intrepid_universe_binary-amd64_Packages, E:The
>   package lists or status file could not be parsed or opened.'
>
>   WORKAROUND:
>   Remove problematic files from /var/lib/apt/lists/ and rerun apt-get
> update.
>
>   In the event that one is connected to a network with a proxy server
>   that returns html pages (like a web page requesting you to login) and
>   not package list files.   Those html files will get downloaded to
>   /var/lib/apt/lists/ and prevent someone from using a package manager
>   until the problem html pages are removed.
>
>   TEST CASE:
>   1) download the dummy-proxy attachment from this bug report
>   2) run dummy-proxy (python dummy-proxy) on a precise system (this
> simulates a proxy that is not allowing access to archive.ubuntu.com and
> gives you   garbage html instead)
>   2.5) Execute 'sudo -i' in a terminal
>   3) Execute 'http_proxy=http://localhost:8080 apt-get update' in same
> terminal
>   4) Observe the following error messages in your terminal:
>   W: GPG error: http://archive.ubuntu.com precise InRelease: File
> /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_precise_InRelease
> doesn't  start with a clearsigned message
>   W: Failed to fetch
> http://archive.ubuntu.com/ubuntu/dists/precise/multiverse/i18n/Index  No
> Hash entry in Release file /var/lib/apt/lists/partial/
>  archive.ubuntu.com_ubuntu_dists_precise_multiverse_i18n_Index
>   W: Failed to fetch
> gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_precise_multiverse_source_Sources
> Encountered a section with no    Package: header
>   5) Stop dummy-proxy
>   6) Execute 'sudo apt-get update' in a terminal
>   7) Observe the following error message:
>   Reading package lists... Done
>   W: GPG error: http://archive.ubuntu.com precise Release: The following
> signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic
>    Signing Key <email address hidden>
>   8) Remove the problematic files in /var/lib/apt/lists (sudo rm
> /var/lib/apt/lists/*)
>
>   Install apt from -proposed
>   1) run dummy-proxy (python dummy-proxy) on a precise system (this
> simulates a proxy that is not allowing access to archive.ubuntu.com and
> gives you   garbarge html instead)
>   1.5) Execute 'sudo -i' in a terminal
>   2) Execute 'http_proxy=http://localhost:8080 apt-get update' in same
> terminal
>   3) Observe the following error messages in your terminal:
>   W: A error occurred during the signature verification. The repository is
> not updated and the previous index files will be used. GPG error: http://
> archive.ubuntu.com precise Release: The following signatures were
> invalid: NODATA 1 NODATA 2
>   W: Failed to fetch
> http://archive.ubuntu.com/ubuntu/dists/precise/Release
>   W: Some index files failed to download. They have been ignored, or old
> ones used instead.
>   4) Stop dummy-proxy
>   5) Execute 'sudo apt-get update' in a terminal
>   6) Observe the update succeed
>
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>