You can run a lot of DOS applications in Dosbox (can be installed by the
command sudo aptitude install dosbox).
Yes, you can dual boot DOS and Linux also. Make a DOS partition (FAT32)
(partition C), you can easily install Freedos or MS-DOS on it and then install
Ubuntu or other Linux on the remaining space by selecting the option "guided-use
largest available free space".
Then it is very easy to access your DOS partition under Linux and copy there
whataver files or programs you need, you can also download DOS programs from the
Internet easily under Linux and place them on the DOS partition and copy any
files from the DOS partition anywhere else.