/usr/share/doc/libgda-5.0-doc/html is in libgda-5.0-doc 5.2.4-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgda-5.0-doc/../../gtk-doc/html/libgda-5.0
/usr/share/doc/libgda-5.0-doc/../../gtk-doc/html/libgda-5.0