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As far as I'm aware, V19 isn't available yet on Linux. I'm going to purchase a license as soon as it's shipping.
However, I've had numerous issues on a trial of V18 on Ubuntu. In 3 weeks of fairly heavy use to try to learn how to use BricsCAD, having no AutoCAD experience, I'd say it has crashed at least 50 times on two different hardware platforms, one Nvidia the other Radeon. I have a QUADRO board arriving any day now and will see if things improve because I suspect at least some of the issues might be video board & driver related.
I'm certainly not switching to Windows for all my work, but I might install Windows 10 just for BricsCAD if you folks tell me that's a smart move given your experience and history with BricsCAD.
What say you?