From the backports.org website in the instructions
where it says
3. All backports are deactivated by default. If you
want to install something from backports run:
apt-get -t etch-backports install ?package?
It would be a good idea to add:
Or for those using aptitude run:
aptitude -t etch-backports install ?package?
It may seem silly but I'm told that aptitude will not
work so well if users use apt-get at times and
aptitude at others. Also it lets users know that
backports works just as well from aptitude as from