Apparently mixing wxWidgets-gtk2 and wxPython-gtk3  is not only an Arch issue anymore, as the upcoming Ubuntu release (bionic) also provides wxPython package built against gtk3 [package: 2, bug report: 3].
There are two things we can do to fix the problem for v5: - Backport python-wxgtk3.0 package built against gtk2. This way everything works as it used to be, but only for the nightlies. For the official release the users would be forced to add a PPA providing the backported package and it sounds troublesome. - Disable KICAD_SCRIPTING_WXPYTHON, as there is still available libwxgtk3.0 package  build against gtk2. The drawbacks are that the Python shell in pcbnew and scripts taking advantage of wxPython to display a GUI will not work anymore. In other news: Ubuntu bionic also ships wxPhoenix . Cheers, Orson 1. https://bugs.launchpad.net/kicad/+bug/1747677 2. https://packages.ubuntu.com/bionic/python-wxgtk3.0 3. https://bugs.launchpad.net/kicad/+bug/1762432 4. https://packages.ubuntu.com/bionic/libwxgtk3.0-0v5 5. https://packages.ubuntu.com/bionic/python3-wxgtk4.0
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