Ubuntu 20.04 upgrade, Python missing libffi.so.6

I recently upgraded my OS to Ubuntu 20.04 LTS.

Now when I try to import a library like Numpy in Python, I get the following error:

ImportError: libffi.so.6: cannot open shared object file: No such file or directory

I tried installing the libffi package, but apt can't locate it :

sudo apt-get install libffiReading package lists... DoneBuilding dependency tree       Reading state information... DoneE: Unable to locate package libffi