Public bug reported:

Binary package hint: apt

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> 
About Ubuntu.
This version (Karmic Koala) was released in October 2009, so its version number 
is 9.10
2) The version of the package you are using, via 'apt-cache policy packagename' 
or by checking in Synaptic.
wi...@rmutk-wijit:~$ apt-cache policy apt
apt:
  Installed: 0.7.23.1ubuntu2
  Candidate: 0.7.23.1ubuntu2
  Version table:
 *** 0.7.23.1ubuntu2 0
        500 http://th.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
3) What you expected to happen
Updates to be downloaded and installed
4) What happened instead
An error!

I'd like to give more information as it may relate to this bug.
1. An orange triangle with a "!" appeared on a status bar
2. A while after that there appears an "Information available" dialog with the 
"Run this action now" button - see the smaller attachment
3. Clicking the button causes popping-up an unnamed dialog saying "An error 
occured" and information which looks informative but hard to understand, such 
as GPG error (what is it), invalid signature and a BADSIG (what are they) and 
[email protected] (who is it) - see the bigger attachment

During the time of using Intrepid and Jaunty I have never seen this. For
those who plan to upgrade to Karmic, please think twice and make sure
you have a modern and not too customized system. This problem occured on
the upgraded machine - an Acer TravelMate 4720 which I have to used it
as it is because I have no way to go back to Jaunty. I loose almost the
whole things in another machine because upgrading failed. I backed up
all my files so they are saved. I can freshly installed Jaunty. However,
I cannot call back applications that I added. Googleearth, for example,
can be installed but not run.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

-- 
apt authentication issue and then update failure
https://bugs.launchpad.net/bugs/488624
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