http://www.virtualbox.org/changeset/37104 and http://www.virtualbox.org/changeset/37105 were the two relevant changesets that I am aware of (they are packaging fixes, but there may have been actual code fixes too that I missed.) 4.0.8 is supposed to contain nothing butcherry picked bug fixes over 4.0.6 (I suppose sometimes we stretch the term "bug fix" a bit) but I don't know what Ubuntu policy is for that sort of update in a released distribution version.
http:// www.virtualbox. org/changeset/ 37104 and http:// www.virtualbox. org/changeset/ 37105 were the two relevant changesets that I am aware of (they are packaging fixes, but there may have been actual code fixes too that I missed.) 4.0.8 is supposed to contain nothing butcherry picked bug fixes over 4.0.6 (I suppose sometimes we stretch the term "bug fix" a bit) but I don't know what Ubuntu policy is for that sort of update in a released distribution version.