Feedback welcomed - if this becomes old or contains misleading information please let me know.
OBS provides some instructions on how to get SRT, but I found that they didn't quite work for me on a fresh minimal install of Ubuntu 20 (Focal). OBS on linux doesn't appear to come with SRT support out of the box.
The OBS Discord community was really helpful, but in the end it took a lot of futzing and following are my notes, in case this is helpful to anyone else.
By the way, if you are considering SRT with OBS, it was extremely painful to install correctly, but then it worked beautifully. The error correction SRT provides was very nice when my wireless signal was poor.