sudo mn not working, maybe because of an error in installation

[alexgasconn]

Expected/Desired Behavior:

The installation should be done without any problem and then use "sudo mn" and start working.

Actual Behavior:

When trying to install mininet with "./util/install.sh -a" , it finished with the message:
Spanish-> "El paquete pep8 no está disponible, pero algún otro paquete hace referencia a él. Esto puede significar que el paquete falta, está obosleto o solo se encuentra disponible desde alguna otra fuente.
E: El paquete <> no tiene un candidadto para la instalación"
English-> "The pep8 package is not available, but is referenced by some other package. This may mean that the package is missing, obsolete, or only available from some other source.
E: Package <> does not have a candidate for installation"

Then, when doing "sudo mn":
Spanish-> "sudo: mn: orden no encontrada"
English-> "sudo: mn: order not found"

Detailed Steps to Reproduce the Behavior:

In a ubuntu VM:
$ cd ~
$ git clone https://github.com/mininet/mininet
$ mininet/util/install.sh -a
$ sudo mn

Additional Information:

I tryied installing python packages like pycodestyle but still not working