Resolved : 1. mount / -rw -o remount 2. removed or rename the /usr/bin/perl symlink of the rescue system 3. mount / -r -o remount 4. cd /tmp 5. wget http://projects.doozan.com/debian/dockstar.debian-squeeze.sh 6. edit dockstar.debian-squeeze.sh and remove '--no-check-gpg ' of the following line : /usr/sbin/debootstrap --verbose --no-check-gpg --arch=$ARCH --variant=$VARIANT --inby thunder - Rescue System