Debian DOSEMU needs FREEDOS
I installed the Debian DOSEMU package, but running dosemu or xdosemu resulted in an error saying the package required FreeDOS to be installed:
Sorry, there is no operating system.
Please try to install FreeDOS.
Problem is, the FreeDOS package is not available under Debian testing.
So I downloaded and installed the Debian unstable FreeDOS package and voila! It works. You can get the FreeDOS Debian unstable package here.