To download and install DOSBox on Ubuntu 20.04, the most direct method is using the standard apt package manager, as DOSBox is included in the official Ubuntu Universe repository. This emulator allows you to run vintage 16-bit and 32-bit MS-DOS software on modern 64-bit systems that no longer support these programs natively.

: Type exit at the Z:\> prompt to close the emulator before making any further configuration. How to Run DOS Games and Programs

: Open your terminal (Ctrl+Alt+T) and run: sudo apt update

DOSBox does not automatically see your Linux files. You must manually "mount" a directory as a virtual drive. LinuxConfig.org Play DOS Games on Linux with DOSBox - LinuxConfig