Use the ChimeraX flatpak.  Red Hat 9 corresponds to Fedora 36, and the Fedora 40 system libraries might not all be compatible with Fedora 36. If you want to dig into the bug more, you could run chimerax under a debugger and look at the backtrace: $ gdb /usr/bin/chimerax (gdb) run (gdb) bt Please let us know what you try and what didn't and what did work.     Good luck,     Greg On 7/18/2024 11:09 AM, Vito Calderone via ChimeraX-users wrote:

I have installed ucsf-chimerax-1.8-1.el9.x86_64.rpm on a fedora 40 pc. Installation was fine. When I launch 'chimerax' I get the following error:

$ chimerax Fatal Python error: Segmentation fault

Current thread 0x00001500f588ab80 (most recent call first):  File "<frozen importlib._bootstrap>", line 241 in _call_with_frames_removed  File "<frozen importlib._bootstrap_external>", line 1233 in create_module  File "<frozen importlib._bootstrap>", line 573 in module_from_spec  File "<frozen importlib._bootstrap>", line 676 in _load_unlocked  File "<frozen importlib._bootstrap>", line 1147 in _find_and_load_unlocked  File "<frozen importlib._bootstrap>", line 1176 in _find_and_load  File "/usr/libexec/UCSF-ChimeraX/lib/python3.11/site-packages/Qt/QtWebEngineWidgets.py", line 4 in <module>  File "<frozen importlib._bootstrap>", line 241 in _call_with_frames_removed  File "<frozen importlib._bootstrap_external>", line 940 in exec_module  File "<frozen importlib._bootstrap>", line 690 in _load_unlocked  File "<frozen importlib._bootstrap>", line 1147 in _find_and_load_unlocked  File "<frozen importlib._bootstrap>", line 1176 in _find_and_load  File "<frozen importlib._bootstrap>", line 241 in _call_with_frames_removed  File "<frozen importlib._bootstrap>", line 1232 in _handle_fromlist  File "/usr/libexec/UCSF-ChimeraX/lib/python3.11/site-packages/Qt/__init__.py", line 112 in qt_have_web_engine  File "/usr/libexec/UCSF-ChimeraX/lib/python3.11/site-packages/chimerax/ui/gui.py", line 108 in __init__  File "/usr/libexec/UCSF-ChimeraX/lib/python3.11/site-packages/chimerax/core/__main__.py", line 653 in init  File "/usr/libexec/UCSF-ChimeraX/lib/python3.11/site-packages/chimerax/core/__main__.py", line 1166 in <module>  File "<frozen runpy>", line 88 in _run_code  File "<frozen runpy>", line 198 in _run_module_as_main

Extension modules: chimerax.arrays._arrays, numpy.core._multiarray_umath, numpy.core._multiarray_tests, numpy.linalg._umath_linalg, numpy.fft._pocketfft_internal, numpy.random._common, numpy.random.bit_generator, numpy.random._bounded_integers, numpy.random._mt19937, numpy.random.mtrand, numpy.random._philox, numpy.random._p cg64, numpy.random._sfc64, numpy.random._generator, chimerax.geometry._geometry, PyQt6.QtCore, PyQt6.QtGui, PyQt6.QtWidgets (total: 18) Segmentation fault (core dumped)

Any hint? Thanks

Vito

--

Dr. Vito Calderone Ph.D.

Associate Professor of Inorganic Chemistry

CERM and Department of Chemistry

University of Florence

Via Luigi Sacconi, 6

50019 Sesto Fiorentino (FI)

Italy

tel: +39 055 457 4276

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