Package: unknown Version: unknown I don't have access to Debian packages at the moment, but I assume this is in one of the base packages. fdisk is installed in /usr/sbin/fdisk. It should be in /sbin/fdisk, so that it can be used in single user mode, or disaster recovery, when only the root partition can be mounted. It would be possible to boot via floppies, of course, but that might be inconvenient.