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
Its probably the libffi6
package that you want, that installs a libffi.so.6
.
sudo apt-get install libffi6
I had the same problem (when I upgrded to Ubuntu 20.04) when I tried to run Jupyter Notebook.
Step 1) --> Just re-install python3.7.6 (the version I was using) :
$ cd path_to_python3.7_folder
$ ./configure --enable-optimizations
$ make
$ sudo make install
Step 2: uninstall jupyter. I used pip3.7 uninstall ... See: How to uninstall Jupyter note book installed by pip3
Step 3: Re-install jupyter again:
$ pip3.7 install jupyterlab
$ pip3.7 install notebook
Try to run jupyter again. It should work.
If you are using pyenv, you should just uninstall the used python version and then reinstall it.
Example:
pyenv uninstall 3.7.4
pyenv install 3.7.4
It's cleaner and safer than renaming system library from my point of view.
It seems like I fixed it. I could be wrong, but here is what I think happened:
What I did to fix it :
Locate libffi.so.7
in your system
$ find /usr/lib -name "libffi.so*"
Create a simlink named libffi.so.6
that points to libffi.so.7
:
sudo ln -s /usr/path/to/libffi.so.7 /usr/lib/path/to/libffi.so.6
UPDATE:
As noted by many users, this fix could have unintended consequences. The better way to do it is to reinstall python as @amichaud explained. This should be used as a last resort IF you're not using pyenv/virtualenv/etc in which case removing python will cause a lot of dependencies to be removed as well.
Same problem for me
What I did was:
pip freeze
to get save my dependencies (as pip didn't work), but fortunately I didn't care about them.I am using Xubuntu 20.04 and recompiling the python version 3.7 did not work for me.
The way I solved this was to download the 19.10 version of the package from here: http://mirrors.kernel.org/ubuntu/pool/main/libf/libffi/libffi6_3.2.1-8_amd64.deb
and then installing it
sudo apt install ./libffi6_3.2.1-8_amd64.deb
This will unpack the libffi.so.6
and libffi.so.6.0.4
files to /usr/lib/x86_64-linux-gnu/
. The libffi.so.6
file is just a link to libffi.so.6.0.4
in the same directory.
As far as I could see this does not overwrite any files so should be safe.
Hopefully this helps someone as well.