1. Listen to the advice from knowledge. 2. There is no guessing. It really is documented how to upgrade. Follow instructions.
http://www.debian.org/releases/wheezy/amd64/release-notes/ch-upgrading.en.html (or whatever link suits your platform) If you follow this guide, and stop reading junk guesses and stories of wierd results from mistaken assumptions, you will get somewhere. Read the guide. It contains the steps. It really does. Chapter 4 is called "Upgrades from Debian 6.0 (squeeze)" . It really means what it says. You must read it before doing the upgrade, not after.
