/usr/bin/sandbox-clone-to-vm is in sandbox-upgrader 0.1+bzr20080818-0ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | #!/bin/bash
#
#  Copyright (c) 2008 Canonical
#
#  Author: Michael Vogt <mvo@ubuntu.com>
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation; either version 2 of the
#  License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, 51 Franklin Street, Fifth Floor, Boston, 
#  MA 02111-1301, USA
BASEPATH=/usr/share/sandbox-upgrader/
VM=kvm
SUITE=$(lsb_release -c -s)
ARCH=$(dpkg --print-architecture)
SCRIPT=$BASEPATH/clone-helper.sh
SIZE=80000
MEM=384
TMPDIR=$PWD
# this builds a bootable vm that is big enough,
# the clone-helper.sh does all the heavy lifting
ubuntu-vm-builder $VM $SUITE \
    --arch $ARCH \
    --user $USER \
    --rootsize $SIZE \
    --mem $MEM \
    --addpkg xserver-xorg-video-cirrus \
    --tmp $TMPDIR \
    --exec $SCRIPT \
    "$@"
 |