I had to downgrade to XWindows to run Squareline. Anytime Squareline tries to open a system dialog on Wayland (like open/save file) the app crashes. Wayland is the default GUI on Ubuntu and Fedora now.
Squareline is almost working on Wayland. The general Squareline UI does work. It is just the system dialogs that crash.
GfxDevice: creating device client; threaded=1; jobified=0
Renderer: llvmpipe (LLVM 13.0.1, 256 bits)
Vendor: Mesa/X.org
Version: 4.5 (Core Profile) Mesa 22.0.5
GLES: 0
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OPENGL LOG: Creating OpenGL 4.5 graphics device ; Context level <OpenGL 4.5> ; Context handle 10846240
Begin MonoManager ReloadAssembly