/usr/bin/adt-xenlvm-on-testbed is in autopkgtest-xenlvm 2.0.1ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../share/autopkgtest/xenlvm/on-testbed
/usr/bin/../share/autopkgtest/xenlvm/on-testbed