http://www.kuro5hin.org/story/2007/4/23/3719/35994

apt-get source xen-hypervisor-3.0.3-1-i386-pae
cd xen-3.0-3.0.3-0/tools/pygrub/
apt-get install e2fslibs-dev

make

cp -av build/lib.linux-i686-2.4/grub/fsys/ext2 /usr/lib/xen-3.0.3-1/lib/python/grub/fsys/

mkdir -pv /var/lib/xen/

ln -s /usr/lib/xen-3.0.3-1/bin/pygrub /usr/bin/pygrub