I'm having trouble downloading software apps from www.getdeb.net, for Linux ubuntu 10.04 LTS I've done a few things like added these: synaptic package manager and go to settings>repositories>other software (tab)> +add button and put in:

deb http://archive.getdeb.net/ubuntu maverick-getdeb apps

close window and reload when asked. Close synaptic. Then open a terminal and do:
wget -q -O- http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -
then
sudo apt-get update:  Then > close window and reload when asked. Close synaptic. Then open a termial and do:
wget -q -O- http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -then
sudo apt-get update.

Now I get this error message:  W: GPG error: http://archive.getdeb.net maverick-getdeb Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8A515F046D7E7CF