I think maybe we should look at this from the basics:
- Is this a standard install?
- Do you have any plugins or custom themes installed?
- When you rebuild, what are the errors in the output (ie. at the end, when it asks you to scroll up for more specific errors, what errors do you see/can you copy the whole thing into a codeblock here so we can see)
- What changes did discourse-doctor make/suggest, and what did you do to ‘reboot’ your instance that made those changes stop working?