Installing the PPA version of KDE 4.3.2

[Donn]

Hi,
I added that ppa thing to my sources.list, but when I do an apt-get update I 
get this mesage:

Get:2 http://ppa.launchpad.net jaunty Release [74.6kB]                     
Ign http://ppa.launchpad.net jaunty Release                                
Get:3 http://ppa.launchpad.net jaunty/main Packages [46.9kB]               
Fetched 122kB in 7s (15.8kB/s)                                                                                         
Reading package lists... Done                                                                                          
W: GPG error: http://ppa.launchpad.net jaunty Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 2836CB0A8AC93F7A                                                                        
W: You may want to run apt-get update to correct these problems

Which is a bit of a catch-22. Any clues to get past this? Is it even a good 
idea to be installing from ppa's -- assuming I want to dist-upgrade in future?

\d
-- 
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https://savannah.nongnu.org/projects/fontypython/

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