I have a few things to say in response:
- First of all, while I am the author of LDView, I don't maintain the Qt version (which is what is used in Linux). I'll see if LDView's Qt maintainer has anything to say.
- I've had nothing but trouble with people getting LDView 4.1 to work on various recent Linux distributions. (I had a post in another thread about shared libraries that somewhat explains this.)
- There are too many Linux distributions for me (or LDView's Qt maintainer) to even think about verifying compatibility on all of them. Having said that, Ubuntu is one of the most popular (possibly the most popular), so we do try our best to support it.