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After upgrading a server to Ubuntu Intrepid I found that the Rails site's layouts broke. The problem is this issue resulting from a ERB code change in Ruby 1.8.7: if you put a # Ruby comment in a one-line <% %> block, all the content up to the next %> that's on a subsequent line is ignored.
This is really annoying, but since not everyone agrees this should work anyway you may need to work around it yourself – put the closing %> on the next line.
It's worth noting that Ruby 1.8.7 is still not recommended for Rails apps due to such issues; stick with Ruby 1.8.6 if you can. Ubuntu users can either stick with Hardy, or pin the Ruby packages to Hardy's version.
I've submitted another patch to Rails for a minor-but-annoying bug – if you use db:migrate:redo you'll find that it does migrate correctly but the schema dump afterwards doesn't work, so db:test:prepare clones the wrong structure (for example).
The patch fixes things so that second and subsequent db:schema:dump invocations work properly. Testing and +1s, as always, very welcome.