Thanks newuser44 !!!
In fact, your help really worked !!! The only thing I did is to stop the firewall at all and now I see the the new updates (firewall, and so on) being installed.
The official repository I used successfully is:
deb
http://ppa.launchpad.net/ebox/ubuntu hardy main
Thanks for your help.
Klaus
I had a similar problem with various repositories.
The only way I could get it to work was to setup a service with tcp destination port 11371 enabled. Then I setup to the firewall to allow my server and internal machines to access this service/port.
Then I followed this to update the key:
.......................................
http://ubuntuforums.org/archive/index.php/t-587936.htmlgpg --keyserver hkp://subkeys.pgp.net --recv-keys $GPGKEY
gpg --export --armor $GPGKEY | sudo apt-key add -
You need to replace $GPGKEY with the key in the error message
..........................................