Repositories on Debian

Sometimes you have to add a new repository to install a new software on debian. Apt, the best thing to happen on gnu/linux distribution has security features that requires you to download gpg keys. So after adding your new repository to the /etc/apt/sources.list, you have to add the corresponding key.

Below is for adding a the quantum gis repository:

1. Add this line to /etc/apt/sources.list:

deb http://debian.gfoss.it/ etch main

2. Adding the repository key to apt keys.

wget http://debian.gfoss.it/debian-gfoss.key
apt-key add debian-gfoss.key

3. To install QGIS:
apt-get install qgis


ref: Titan Readme