Running on Ubuntu 18.04 + Lutris as well, I can’t log into any servers at this point. I just get the realm select screen but then it times out and I get WOW51900328.
This is pretty frustrating as up until now things have been running great. And windows is not an option as the only Windows machine I have is an old windows 7 box with a sketchy hard drive no one’s plugged in for over a year.