/usr/share/help/bg/glade/index.docbook is in glade 3.16.1-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/help/bg/glade/../../../help-langpack/bg/glade/index.docbook
/usr/share/help/bg/glade/../../../help-langpack/bg/glade/index.docbook