I tried this morning to upgrade from potato to woody. The procedure I followed was: apt-cdrom add apt-get update apt-get dist-upgrade After inserting the appropriate CD, apt-get returned the following the eror message: E: Internal Error: Couldn't configure a pre-depend. Apt-get stopped after the error message. apt-get upgrade worked but clearly that is not a dist-upgrade. How can I get fix the abovementioned error to have a successful dist-upgrade? Thanks Johan