Pages (iWork) is not displaying fonts correctly

I'm using the popular font Ubuntu (as this is our corporate font) in Pages (5.2). Everytime I type an apostrophe it turns it into a little superscript 9. If I type single quotes these become superscript 8's and 9's. Sample below:

Obviously, it is the substitutions for curly quotes that are doing this but why can't Pages display the fonts correctly. This works perfectly with this same font in Text Edit including the susbstitutions. It also works perfectly in Pages 09 (4.3).

So frustrating. Everytime I try to upgrade to any of the new iWork applications I find a bug or missing feature that forces me back to the previous version!