/usr/share/doc/ubuntu-packaging-guide-html-uk/_static/searchtools.js is in ubuntu-packaging-guide-html-uk 0.3.8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ubuntu-packaging-guide-html-uk/_static/../../../javascript/sphinxdoc/1.0/searchtools.js