/usr/share/doc/libqt4-private-dev/LGPL_EXCEPTION.txt is in libqt4-private-dev 4:4.8.1-0ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libqt4-private-dev/../libqtcore4/LGPL_EXCEPTION.txt