Is it possible that some installation and recovery method pages are not deleted but moved, probably by @tmomas on 2019/09/14?
- inbox:docs:installation:... moved to docs:guide-user:installation:installation_methods:...
- inbox:docs:recovery:... moved to docs:guide-user:installation:recovery_methods:...
Maybe certain configurations were not adjusted after these moves. That seems to be noticeable on e.g. some "Techdata" pages. The "Dataentry" for "Installation method(s)" and "Recovery method(s)" are sometimes giving a links to a page with message "This page does not exist anymore".
If so, I hope @tmomas or somebody with sufficient rights can update the configuration and "RFC: Installation instructions + ToH" information.