Except when you need a different version of postgresql than the one packaged by Ubuntu, you have to use ppas or something even more horrific: snaps. Otherwise you just put your stuff in a container, problem solved. I'm not for containerizing everything, it just adds useless complexity. But it's a useful tool.

I guess my point was that if one is serious about shipping a system on a robot, one doesn't use Ubuntu :-).

But sure, it's easier to throw everything in a container and that's why people do it.