The install guide for Debian/kFreeBsd found here: http://glibc-bsd.alioth.debian.org/doc/sysreq.html has a minor error. It suggests that 500Mb is enough disk space to 'play with' the system. Imagine my bemusement when I discovered that a 1Gigabyte qemu cow2 disk failed to install due to lack of disk space. I switched to a 2Gigabyte disk, and install succeeded.