pre-removal script

where is the pre-removal script for gdm (gnome display manager) also how do i make it NOT get executed on 'dpkg --purge' -notjunkd/will

apt-get dist-upgrade -f giving some odd error when trying to remove gdm

hi, i typed in, apt-get dist-upgrade -f it downloads all the files like normal, but for them to install it had to remove a package called gdm... this is what it said when it tried to remove it: Removing gdm ... dpkg: error processing gdm (--remove): subprocess pre-removal script returned error ex