Question about ubuntu untrusted source, gpg, keyserver

Posted by ??? on Super User See other posts from Super User or by ???
Published on 2010-06-10T12:26:07Z Indexed on 2010/06/10 12:33 UTC
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ubuntu

|

apt

|

gpg

I have mirrored the ubuntu archive repository (I must say it's rather huge). Then, I can apt-get install with no problem, but it prompts with following warning:

WARNING: The following packages cannot be authenticated!
  xxxx, xxxx, ...
Install these packages without verification [y/N]?

Well, you can always install it.

But, I can't install from the ubuntu software GUI. Which require trusted source.

So,

1. How to force the GUI to install untrusted package?
2. Should I configure GPG to receive some public keys? 
   (I've already installed ubuntu-keyring, debian-keyring, but it still untrusted)
3. Should I configure GPG to receive unknown keys from some specific keyservers, automatically?

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