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First NixOS attempt: pip wheel PySide6 cannot load libgthread-2.0.so.0 because NixOS has no FHS library paths. Nothing inside the venv can fix that (KiCad installs wheels only) - but the plugin made it worse twice over: - The backend probe imported bare PySide6, whose pure-Python __init__ succeeds even when QtCore's .so cannot load - so matplotlib was promised QtAgg and the error figure died at switch_backend, taking the failure report with it. The probe now imports <binding>.QtCore and falls through to Tk/Agg on a broken Qt. - The user got a raw ImportError traceback. A cannot-open-shared-object failure during the kipy/dialog imports now raises a UserFacingError that names the actual fixes: run KiCad in an FHS environment (steam-run) or enable nix-ld with Qt runtime libraries. The README Linux notes carry the same guidance. 141 passed on the dev stack and the Python 3.9 mac-equivalent stack. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>