Thanks for the responses. For some reason my message took ages to appear
in the list, by which point I'd solved the problem myself by doing 'sudo
apt remove nginx' and reinstalling by building from source instead
(albeit 0.7.65 instead of 0.7.67). I assume there is some kind of quirk
in the Ubuntu 10.10 repository version, it's certainly not something I'd
seen before. Now all pages are served as expected.

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