/usr/share/xen-tools/karmic.d/05-shadowconfig-on is in xen-tools 4.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/xen-tools/karmic.d/../common/05-shadowconfig-on
/usr/share/xen-tools/karmic.d/../common/05-shadowconfig-on