I bought Debian Sarge's CDs and added them to my /etc/apt/sources.list using apt-cdrom add. Since I don't want to use Debian's packages if any Ubuntu package is available I created a apt/preferences file with the following content :
Pin: release o=Ubuntu
Pin: release o=Debian
but when I want to do a apt-get (dist-)upgrade it says that about 300 packets are about to be updated...
I don't understand what's wrong in my apt/preferences file. I even tried to put the pin priority to -10 for debian packages and it keeps on wanting to replace ubuntu packages with debian's.
If any one has any clue...