/usr/share/gtk-doc/html/gucharmap-2.90/ is in libgucharmap-2-90-dev 1:3.10.1-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/gucharmap-2.90/GucharmapBlockChaptersModel.html
/usr/share/gtk-doc/html/gucharmap-2.90/GucharmapCodepointList.html
/usr/share/gtk-doc/html/gucharmap-2.90/GucharmapScriptChaptersModel.html
/usr/share/gtk-doc/html/gucharmap-2.90/ch01.html
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-2.90.devhelp2
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-gucharmap-chapters-model.html
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-gucharmap-chapters-view.html
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-gucharmap-charmap.html
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-gucharmap-chartable.html
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-gucharmap-script-codepoint-list.html
/usr/share/gtk-doc/html/gucharmap-2.90/gucharmap-gucharmap-unicode-info.html
/usr/share/gtk-doc/html/gucharmap-2.90/home.png
/usr/share/gtk-doc/html/gucharmap-2.90/index.html
/usr/share/gtk-doc/html/gucharmap-2.90/index.sgml
/usr/share/gtk-doc/html/gucharmap-2.90/left.png
/usr/share/gtk-doc/html/gucharmap-2.90/right.png
/usr/share/gtk-doc/html/gucharmap-2.90/style.css
/usr/share/gtk-doc/html/gucharmap-2.90/up.png