Installing pygal under Ubuntu 18.04

[ybeco]

Hi

Here is the output

Output:
yonnel@yonnel-Z97X-Gaming-7:~$ apt search cffi
En train de trier... Fait
Recherche en texte intégral... Fait
cl-cffi/bionic,bionic 1:0.19.0-1 all
  The Common Foreign Function Interface for Common Lisp

cl-plus-ssl/bionic,bionic 20170630-1build1 all
  Common Lisp interface to OpenSSL

python-cairocffi/bionic,bionic 0.8.0-0ubuntu2 all
  cffi-based cairo bindings for Python

python-cairocffi-doc/bionic,bionic 0.8.0-0ubuntu2 all
  cffi-based cairo bindings for Python - Documentation

python-cffi/bionic,bionic 1.11.5-1 all
  Foreign Function Interface for Python calling C code

python-cffi-backend/bionic,now 1.11.5-1 amd64  [installé, automatique]
  Foreign Function Interface for Python calling C code - backend

python-cffi-backend-dbg/bionic 1.11.5-1 amd64
  Foreign Function Interface for Python calling C code (Debug version)

python-gphoto2cffi/bionic 0.3~a1-1build1 amd64
  GPhoto2 bindings with simpler API

python-xcffib/bionic 0.5.1-1build3 amd64
  This package is a Python binding for XCB (Python 2)

python3-cairocffi/bionic,bionic,now 0.8.0-0ubuntu2 all  [installé, automatique]
  cffi-based cairo bindings for Python (Python3)

python3-cffi/bionic,bionic,now 1.11.5-1 all  [installé, automatique]
  Foreign Function Interface for Python 3 calling C code

python3-cffi-backend/bionic,now 1.11.5-1 amd64  [installé]
  Foreign Function Interface for Python 3 calling C code - runtime

python3-cffi-backend-dbg/bionic 1.11.5-1 amd64
  Foreign Function Interface for Python 3 calling C code (Debug version)

python3-gphoto2cffi/bionic 0.3~a1-1build1 amd64
  GPhoto2 bindings with simpler API

python3-xcffib/bionic,now 0.5.1-1build3 amd64  [installé, automatique]
  This package is a Python binding for XCB (Python 3)

yonnel@yonnel-Z97X-Gaming-7:~$ 

It's seem's to be ok! But it don't works...
I'm using a fresh installed Ubuntu 18.04.1