/usr/share/ is in isdnutils-xtools 1:3.25+dfsg1-3.7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/isdnutils-xtools/
/usr/share/doc/isdnutils-xtools/README
/usr/share/doc/isdnutils-xtools/copyright
/usr/share/doc/isdnutils-xtools/README.Debian
/usr/share/doc/isdnutils-xtools/examples/
/usr/share/doc/isdnutils-xtools/examples/xisdnload-netup
/usr/share/doc/isdnutils-xtools/examples/xmonisdn-netup
/usr/share/doc/isdnutils-xtools/examples/xisdnload-netdown
/usr/share/doc/isdnutils-xtools/examples/xmonisdn-netdown
/usr/share/man/
/usr/share/man/man1/
/usr/share/man/man1/xisdnload.1x.gz
/usr/share/menu/
/usr/share/menu/isdnutils-xtools
/usr/share/doc/isdnutils-xtools/changelog.Debian.gz