disable partman from debian preseed

disable-partman-hack_preseed.cfg

# Thanks to http://ubuntuforums.org/showthread.php?t=1411273 for inspiration..
# But what a disgusting nasty hack! This prevents partman from running (and
# mounts /target, creates /target/etc/fstab). d-i just can't cope with
# installation to partitionless block device... which is disappointing,
# because partitions are pointless for pvlinux guests.
#
# The hack works by ... wait for it... spawning a little while/sleep 1 script,
# waits for the partman-base.postinst file to appear (the preseed/earl_command
# hook is too early, and the partman/early_command is too late). Once it
# appears we replace this with a bit more script which does what we wanted
# partman to do (or not do) all along.
#
# Okay, so perhaps we should just debootstrap... but preseeds are a bit more
# portable and I happened to have a lot of infra invested in preseed approach.
d-i preseed/early_command string echo 'while [ ! -f /var/lib/dpkg/info/partman-base.postinst ]; do sleep 1; done; cat /tmp/dis_pm > /var/lib/dpkg/info/partman-base.postinst' > /kill-partman.sh && \
    echo "sh -c ' \
        mkdir -p /target && \
        modprobe btrfs && \
        mount -t btrfs /dev/xvda /target && \
        mkdir /target/etc && \
        mount && \
        echo \"/dev/xvda / btrfs noatime,nodiratime 0 1\" > /target/etc/fstab && \
        echo \"/dev/xvdb none swap sw 0 0\" >> /target/etc/fstab' \
        >/tmp/kill-partman-stage2.log 2>&1" > /tmp/dis_pm && \
    sh /kill-partman.sh >/tmp/kill-partman.log 2>&1 &

I wish partman had support for partitionless disk. That would make this whole process so much easier, but thanks for your contribution!

When I try using this code (on a 16.04 install), I'm running into an error:

"Installation step failed...the failing step is Partition Disks"

From the console I can see "Configuring 'partman-base' failed with error code 225"

How did you get passed this in your case?