Comment 12 for bug 287894

Lieven: In general, the executable has to be rebuilt with the changes that the patch describes applied. In this case, the package maintainer has to rebuild the dosbox package.

Alternatively, you can rebuild the package yourself. I'm not able to advise you about how to do that, since I don't use Ubuntu and am not familiar with the packaging system, but I'm sure you'd be able to find a good piece of documentation somewhere around the net, or maybe someone to do the build for you.