[Bug 1592040] Re: Can't update repos due to signing problems

[Francesco]

Probably solved by following the suggestions at
https://gist.github.com/piersharding/ffc505564a82daaf6ff33d951f568dad

In /etc/apt I moved trusted.gpg* in a backup directory and runned  "sudo apt-key update".
After that I runned "sudo apt-get update": it gave no error or warnings, but apparently it did not accomplish the update.

On the contrary, the Software Updater on the GUI made the whole work
without any error and correctly updated the system (at least, it seems
so).

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Title:
  Can't update repos due to signing problems

Status in apt package in Ubuntu:
  Confirmed

Bug description:
  I can't update the repos through 'sudo apt-get update' due to these
  errors:

  W: Errore GPG: http://archive.ubuntu.com/ubuntu xenial InRelease: Errore sconosciuto durante l'esecuzione di apt-key
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial InRelease' is not signed.
  N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  W: Errore GPG: http://archive.ubuntu.com/ubuntu xenial-updates InRelease: Errore sconosciuto durante l'esecuzione di apt-key
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial-updates InRelease' is not signed.
  N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  W: Errore GPG: http://archive.ubuntu.com/ubuntu xenial-backports InRelease: Errore sconosciuto durante l'esecuzione di apt-key
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial-backports InRelease' is not signed.
  N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  W: Errore GPG: http://archive.ubuntu.com/ubuntu xenial-security InRelease: Errore sconosciuto durante l'esecuzione di apt-key
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial-security InRelease' is not signed.
  N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
  N: See apt-secure(8) manpage for repository creation and user configuration details.

  The /etc/apt/sources.list contains only the official Ubuntu repo since
  it's untouched from a clean 16.04 install.

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