exalt@edlap:~$ sudo apt-get install cython
Reading package lists... Done
Building dependency tree
Reading state information... Done
cython is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
exalt@edlap:~$ cython
The program 'cython' is currently not installed. You can install it by typing:
sudo apt-get install cython