Can someone help me understand this message "packages cannot be authenticated"

[john]

Thanks Jonathan!

On Wed, Oct 28, 2009 at 11:20 PM, Jonathan Carter (highvoltage)
<jonathan at ubuntu.com> wrote:
> Hi John
>
> john wrote:
>> I have an LTSP server running Jaunty. I want to install apticron on
>> the server.  Apt wants to install an MTA along with apticron which is
>> fine with me, however
>> it wants to install postfix AND exim4 and it also warns that the
>> packages cannot be authenticated. Can someone help me understand why
>> this might be happening.
>
> For security purposes, mirrors are usually signed so that when you're on
> a connection that can't be completely trusted, you'll know that the
> server you're getting packages from is the one that you initially added.
> On you're side you'll need to add the public key for
> us.archive.ubuntu.com, I'm not sure why it's not on your system, it
> might be that they have changed their key and now you'll have to import
> a new public one.
>
> According to this forum post:
> http://ubuntuforums.org/archive/index.php/t-964342.html
> this should work:
> sudo gpg --keyserver wwwkeys.eu.pgp.net --recv-keys 106A92EF1E5F9737
> sudo gpg --armor --export 106A92EF1E5F9737 | apt-key add -
> sudo apt-get update
>
> HTH
>
> -Jonathan
>
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