Sleepie,
You don't say what problem you are having!
Does the Doom icon show in the "Play" tab of your desktop?
If I recall correctly Doom requires other files (SDL mixer etc.) to be installed also.
They are all on the linked page.
Follow fu53b0x's instructions earlier in this thread and all should be OK.
Good luck,
Martin
Martin's right
Owing to the fact that I am a 70s computer kid who built his ZX81

, I confess that I will install
anything just to see what happens...and thus, I have SDL (SDL, mixer & net) installed but I am not sure if there are other dependencies
:aside: I have successfully installed the Fluxbox GUI which is nice and clean (I did brick the machine in the process but nothing that the command line, google, time and a beer couldn't solve!)