/etc/vmbuilder/debian/devicemap.tmpl is in python-vm-builder 0.12.4+bzr494-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #for $disk in $disks
$disk.get_grub_id() /dev/$prefix$disk.devletters()
#end for
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