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    Did you run sudo apt update after editing your configuration? Commented Oct 14, 2024 at 15:15
  • @Stephen Kitt Thanks so much. Following your instructions I could set up libffi-dev:amd64 (3.1-2+deb8u1) on my Linux HPC. However, the issue "No module named 'ctypes' " still persists. Please see below : ----------------------------------- File "/opt/spack-votca/spack/lib/spack/external/archspec/vendor/cpuid/cpuid.py", line 10, in <module> import ctypes File "/opt/python-3.11.5/lib/python3.11/ctypes/__init_.py", line 8, in <module> from _ctypes import Union, Structure, Array ModuleNotFoundError: No module named '_ctypes' --------------------------------- Sugegstions? Commented Oct 16, 2024 at 11:46
  • You should ask whoever installed /opt/python-3.11.5... Commented Oct 16, 2024 at 13:10
  • I myself installed python-3.11.5. It is working fine at other fonts. Do you suggest any troubleshooting approach? Thanks Commented Oct 18, 2024 at 15:04
  • OK, you need to re-install it after the libffi-dev installation (see the SO post you linked to). Commented Oct 18, 2024 at 15:26