Ubuntu 20.04 missing libffi 6 causing bundled python 3 to fail on ctypes import #16
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I installed fomu-toolchain-linux_x86_64-v1.5.6 on Ubuntu 20.04 which lacks libffi 6 (7 is the only package in the repos). Working through the workshop I encountered an error building blink.py in the migen section. The same error can be seen when trying to import ctypes with the python3 included in the toolchain.
>>python3 -c "import ctypes"
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/brett/Repositories/im-tomu/fomu-workshop/fomu-toolchain-linux_x86_64-v1.5.6/lib/python3.6/ctypes/__init__.py", line 7, in <module>
from _ctypes import Union, Structure, Array
ImportError: libffi.so.6: cannot open shared object file: No such file or directorySome other system information:
>>lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
>>dpkg -l | grep libffi
ii libffi-dev:amd64 3.3-4 amd64 Foreign Function Interface library (development files)
ii libffi7:amd64 3.3-4 amd64 Foreign Function Interface library runtime
>>apt search libffi6
Sorting... Done
Full Text Search... DoneAlso, I can successfully run the blink.py script with my system python.
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