On Sun, 2 Jan 2011, Kenny Hitt wrote:
To upgrade from lenny to squeeze, change lenny to squeeze for all lines in your sources.list. Then, run aptitude update before running aptitude dist-upgrade
A few points:1. The Squeeze release notes recommend using apt-get to do the upgrade, not aptitude. They don't say why.
2. The same notes recommend doing an "apt-get upgrade" before "apt-get dist-upgrade", and also recommend making sure the kernel and udev are updated before rebooting and doing the dist-upgrade step.
There's also other things to be aware of before running this upgrade, so the release notes are worth reading.
http://www.debian.org/releases/squeeze/releasenotes Geoff.