Thanks for your bug report. This looks similar to bug #75188. Could you try if installing yelp package fixes this issue.
** Changed in: gnome-app-install (Ubuntu)
Assignee: (unassigned) => Pascal De Vuyst
Status: Unconfirmed => Needs Info
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help button does not work in gnome-app-install
https://launchpad.net/bugs/78698
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