$ sudo vi /etc/apt/sources.list
$ tail -3 /etc/apt/sources.list
# alexm
deb http://ppa.launchpad.net/alex.muntada/ubuntu hardy main
deb-src http://ppa.launchpad.net/alex.muntada/ubuntu hardy main

##</code><code>##

$ wget 'http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0x2DDC42192DF36811' -O- | sudo apt-key add -

##</code><code>##

$ sudo apt-get update

##</code><code>##

$ sudo apt-get install libpadre-perl