Error installer Pidgin on Ubuntu

[Abdul Najib]

Hello

I'm Abd Najib from Indonesia,

I use Ubuntu Ubuntu 8.04.2

I try to install pidgin 2.5.7 with the instruction on the web

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com \
    67265eb522bdd6b1c69e66ed7fb8bee0a1f196a8

. /etc/lsb-release

echo deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu \
    $DISTRIB_CODENAME main | \
    sudo tee /etc/apt/sources.list.d/pidgin-ppa.list
================================
And the message error
Error Message
W: GPG error: http://ppa.launchpad.net hardy Release: The following
signatures were invalid: BADSIG 7FB8BEE0A1F196A8 Launchpad PPA for Pidgin
Developers


Thank's
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