Use DOSBox to run your old DOS Games in Ubuntu

DOSBox is a x86 DOS emulator that can be used to run old DOS-games under OS that don’t support it like Win2k, XP, FreeBSD and Linux. Graphics and sound emulation are optimal. This free, open source, cross platform application that supports over 3,000 games also provides a quick installation from the repositories in Ubuntu with

sudo apt-get install dosbox

Originally compiled for Red Hat Linux and variants like Fedora you can also download the .rpm package and convert it to a .deb package with alien

For how to get started, refer to this document at the Ubuntu Community.