/usr/share/gtk-doc/html/ is in libebook1.2-dev 3.2.3-0ubuntu6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/libebook/
/usr/share/gtk-doc/html/libebook/annotation-glossary.html
/usr/share/gtk-doc/html/libebook/api-index-1.12.html
/usr/share/gtk-doc/html/libebook/api-index-2.22.html
/usr/share/gtk-doc/html/libebook/api-index-2.24.html
/usr/share/gtk-doc/html/libebook/api-index-2.26.html
/usr/share/gtk-doc/html/libebook/api-index-2.28.html
/usr/share/gtk-doc/html/libebook/api-index-2.30.html
/usr/share/gtk-doc/html/libebook/api-index-2.32.html
/usr/share/gtk-doc/html/libebook/api-index-3.0.html
/usr/share/gtk-doc/html/libebook/api-index-3.2.html
/usr/share/gtk-doc/html/libebook/api-index-deprecated.html
/usr/share/gtk-doc/html/libebook/api-index-full.html
/usr/share/gtk-doc/html/libebook/ch01.html
/usr/share/gtk-doc/html/libebook/ch02.html
/usr/share/gtk-doc/html/libebook/home.png
/usr/share/gtk-doc/html/libebook/index.html
/usr/share/gtk-doc/html/libebook/index.sgml
/usr/share/gtk-doc/html/libebook/left.png
/usr/share/gtk-doc/html/libebook/libebook-EAddressWestern.html
/usr/share/gtk-doc/html/libebook/libebook-EBook.html
/usr/share/gtk-doc/html/libebook/libebook-EBookClient.html
/usr/share/gtk-doc/html/libebook/libebook-EBookClientView.html
/usr/share/gtk-doc/html/libebook/libebook-EBookView.html
/usr/share/gtk-doc/html/libebook/libebook-EContact.html
/usr/share/gtk-doc/html/libebook/libebook-EDestination.html
/usr/share/gtk-doc/html/libebook/libebook-ENameWestern.html
/usr/share/gtk-doc/html/libebook/libebook-EVCard.html
/usr/share/gtk-doc/html/libebook/libebook-e-book-query.html
/usr/share/gtk-doc/html/libebook/libebook-e-book-types.html
/usr/share/gtk-doc/html/libebook/libebook.devhelp2
/usr/share/gtk-doc/html/libebook/right.png
/usr/share/gtk-doc/html/libebook/style.css
/usr/share/gtk-doc/html/libebook/up.png