I need some help in understanding how the Yelp Help Browser works. When I start Yelp in Ubuntu 17.10 I get the Ubuntu Desktop Guide, and when I search for terms that should definitely be contained in some of the documentation packages I recently installed, I come up blank.
My understanding (based on this page at gnome.org) is that Yelp uses scrollkeeper's catalogue to generate a table of contents, but it seems that this behaviour is overridden in the Ubuntu distro. Also the Ubuntu version does not have the menus (enabling bookmarking etc.) displayed on the screenshot at that page. When installing the documentation packages I got feedback in the terminal that the package was registered with scrollkeeper. I'll keep searching for an answer, but if you could help out, it would be greatly appreciated.