Is the package gnome-user-guide installed on your system?
Run this command from a terminal:
$ dpkg-query -l gnome-user-guide | cat
** Changed in: gnome-user-docs (Ubuntu)
Sourcepackagename: None => gnome-user-docs
Status: New => Incomplete
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Help Links not working in Menus - Page not found
https://bugs.launchpad.net/bugs/131697
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Bugs, which is the bug contact for Ubuntu.
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