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Proton 9.0-3 released
(github.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Proton is well developed for games, but not for apps. But Wine itself is not as well taken cared for. Without tricks, patches and prayers, most complex apps don't run on it. Or if they load, they crash quickly afterwards.
Which CAD app are you trying to run? If it's 2D, have you tried QCad/Cam?