9.1. Old stuff; repository not found
There comes a time that your nslu2 should have been upgraded but for some reason,
it wasn't. And then suddenly apt-get stops working.
The solution is to upgrade, but for that you need a repository.
So, put the line
deb http://archive.debian.org/debian/ etch main
Now it works again.
9.2. A failing power supply
The powersupply of the NSLU2 is weak. It must be replaced with something new after a year.
On the website of the Debian NSLU2, many recomendations are done. I have more than one SLUG,
so I decided to go for a better solution.
Oh, and despite what others say, a failing powersupply can break your slug. So replace it early.