Doom, but compiled on ubuntu.
Built using this video.

In order to compile doom, you will need to do the following packages installed:

• build-essential
• libx11-dev
• libext-dev
• xserver-Xephyr

There were some issues with the stock code released for doom, I have followed the instructions in the video to make the required changes.

To compile Doom, it is super simple.

1. Find a copy of the doom wad file(you can grab a copy from this website right here)
2. Place it into the linuxdoom-1.10 folder
3. cd into the linuxdoom-1.10 folder and run the make command
4. Launch a new window using Xephyr of size 640 by 480, with 8 bits of color depth
5. Run the binary at linuxdoom-1.10/linux/linuxxdoom passing the appropriate option to target the Xephyr display
   In practice, this looks like:

cp <PATH TO YOUR WAD FILE>/DOOM1.WAD UDoom/linuxdoom-1.10/doom1.wad
cd UDoom/linuxdoom-1.10/
make

Now at this point, you should open another terminal window and launch the Xephyr window:

xephyr :2 -ac -screen 640x480x8

Return to the other terminal and run the below:

./linux/linuxxdoom -2

Congratulations! You are now running Doom on your Ubuntu PC!
Note: So far, this only runs on Ubuntu 22.04.1 LTS