Benutzername wrote:16.4 is the latest stable Ubuntu version and 18.4 will be the next stable version.
The in between versions 16.10, 17.4 and 17.10 are clearly marked as unstable and volatile. They are targeted at adventurous users who want to experiment with the latest features and functions. Usually this is no problem but sometimes experiments just don't turn out well.
If u-he supports 18.4 then all will be good.
Well actually Ubuntu Studio "clearly marks" 17.04 as the "regular version", not the unstable version, but that's neither here nor there. From what I've gleaned from the discussion here, the issue with the nav windows doesn't appear to be a glitch with Ubuntu per se, but a problem arising from the way the plugins are coded to interact with X, so it's not clear that the problem is caused by any instability on the part of Ubuntu.
As far as I'm aware, u-he isn't exactly supporting Linux, which is why I was asking whether it was likely to be an issue the devs will address presuming that whatever is causing the problem persists in later version of Ubuntu.