Asked by GIUSEPPE MASSETANI on 2013-08-30

I'm working with an Ubuntu 12.04 Operating System installed in my pc. Updates of packages/repositories have always been working pretty well, so far. But now, and for the last 29 days, the update manager keeps saying that there are no package updates available via Internet. Now, I am wondering: this sounds really very strange, updates come continuously, or almost continuously, with Ubuntu. Is it possible there are no updates for 29 days....?????????? Has this ever happened to you???? Where is the problem, and how can I fix it??? Actually there could be some computer security problems behind this!!! Can someone help me???? Thank you very much indeed!!!

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Thomas Krüger (thkrueger) said : #1

Can you please open the Terminal by pressing Ctrl+Alt+T, enter the following command, press Enter and copy the full output for us? Thanks!

sudo apt-get update

(It will ask for your password.)

I have entered the command line in the terminal, just as you asked me to do, Thomas.
Please find here below the full output by the terminal:

Scaricamento di:1 precise-updates Release.gpg [198 B]
Trovato precise Release.gpg
Trovato precise Release.gpg
Trovato precise-security Release.gpg
Trovato precise-backports Release.gpg
Trovato precise Release
Trovato precise-security Release
Scaricamento di:2 precise-updates Release [49,6 kB]
Trovato precise Release
Err precise-updates Release

Trovato precise/partner i386 Packages
Trovato precise-backports Release
Trovato precise-security/main Sources
Ign precise/partner TranslationIndex
Trovato precise-security/restricted Sources
Trovato precise-security/universe Sources
Trovato precise-security/multiverse Sources
Trovato precise-security/main i386 Packages
Trovato precise-security/restricted i386 Packages
Trovato precise/universe Sources
Trovato precise-security/universe i386 Packages
Trovato precise-security/multiverse i386 Packages
Trovato precise-security/main TranslationIndex
Trovato precise-security/multiverse TranslationIndex
Trovato precise-security/restricted TranslationIndex
Trovato precise-security/universe TranslationIndex
Trovato precise/main Sources
Trovato precise-security/main Translation-en
Trovato precise-security/multiverse Translation-en
Trovato precise-security/restricted Translation-en
Trovato precise/multiverse Sources
Trovato precise-security/universe Translation-en
Trovato precise/universe i386 Packages
Trovato precise/main i386 Packages
Trovato precise/multiverse i386 Packages
Trovato precise/main TranslationIndex
Trovato precise/multiverse TranslationIndex
Ign precise/partner Translation-it_IT
Trovato precise/universe TranslationIndex
Ign precise/partner Translation-it
Trovato precise-backports/main Sources
Ign precise/partner Translation-en
Trovato precise-backports/restricted Sources
Trovato precise-backports/universe Sources
Trovato precise-backports/multiverse Sources
Trovato precise-backports/main i386 Packages
Trovato precise-backports/restricted i386 Packages
Trovato precise-backports/universe i386 Packages
Trovato precise-backports/multiverse i386 Packages
Trovato precise-backports/main TranslationIndex
Trovato precise-backports/multiverse TranslationIndex
Trovato precise-backports/restricted TranslationIndex
Trovato precise-backports/universe TranslationIndex
Trovato precise/main Translation-it
Trovato precise/main Translation-en
Trovato precise/multiverse Translation-it
Trovato precise/multiverse Translation-en
Trovato precise/universe Translation-it
Trovato precise/universe Translation-en
Trovato precise-backports/main Translation-en
Trovato precise-backports/multiverse Translation-en
Trovato precise-backports/restricted Translation-en
Trovato precise-backports/universe Translation-en
Scaricamento di:3 precise Release.gpg [72 B]
Trovato precise Release
Trovato precise/main Sources
Trovato precise/main i386 Packages
Ign precise/main TranslationIndex
Ign precise/main Translation-it_IT
Ign precise/main Translation-it
Ign precise/main Translation-en
Recuperati 271 B in 6s (43 B/s)
Lettura elenco dei pacchetti... Fatto
W: Si è verificato un errore nel verificare la firma. Il repository non è aggiornato e verranno usati i file indice precedenti. Errore GPG: precise-updates Release: Le seguenti firme non erano valide: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

W: Impossibile recuperare

W: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi."

I look forward to your reply. Anyway the iltalian expressions mean, more or less, that there werre problems with the signing key and the repository was not updated...............

N1ck 7h0m4d4k15 (nicktux) said : #3

Try these commands please

    sudo apt-key adv --recv-key --keyserver 40976EAF437D05B5

    sudo apt-get update

    sudo apt-get dist-upgrade


Thank you very much for your suggestions, Nick. But I haven't managed to solve my problem, yet. The last two commands simply did not work. I shall write here under what the terminal said after the first command line:

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.HHyxaOr5FO --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-key --keyserver 4097EAF437D05B5

Dear friends, I have eventually managed to solve my problem. I found a solution in In the topic of this Ubuntu forum I found a command line which solved my problem.
So all I had to digit, in order to delete the bad signature key was:

sudo rm -r /var/lib/apt/lists/* -vf

Thank you all very much for your help and attention!!!