When I run a tex file containing \renewcommand*{\sideparfont}{\small\itshape} on my MacBook it works perfectly but when I am running it on my Ubuntu 10.10 machine I get: !LaTeX Error: \sideparfont undefined. I just upgraded my Ubuntu machine to the latest version so it feels unlikely that it should be a too old version but then again maybe that is it?
If so, how can I get a version where this works? (It says it is version: pdfTex 3.1415926-1.40.10-2.2 (TeX Live 2009/Debian))