Missing `graphviz` - please run `conda install fastbook`

Hi there. I’m having the same issue trying to run the first notebooks from my Ubuntu machine at home. But with me, it seems a little bit more awkward. When I try to instal through conda, I receive the message bellow:

Package python conflicts for:
defaults|defaults/linux-64::python==3.7.9=h7579374_0
defaults/linux-64::python==3.7.9=h7579374_0The following specifications were found to be incompatible with your system:

  • feature:/linux-64::__cuda==10.2=0

Your installed version is: 10.2

But my installed version of Cuda is 10.1.
$ nvcc --version
nvcc: NVIDIA ® Cuda compiler driver
Copyright © 2005-2019 NVIDIA Corporation
Built on Sun_Jul_28_19:07:16_PDT_2019
Cuda compilation tools, release 10.1, V10.1.243

$ conda list | grep cud
cudatoolkit 10.1.243 h6bb024c_0 anaconda
cudnn 7.6.5 cuda10.1_0 anaconda
pytorch 1.6.0 py3.7_cuda10.1.243_cudnn7.6.3_0 pytorch

I followed the step suggested by yelwinsoe, it has been installed, but makes no difference at all. Then, I followed the steps suggested by heraldb and found the same problem: when I run from the notebook the pip install comand and try to import fastbook, I get the message that graphviz is missing. Tried also conda install python-graphs, as long as conda install -c conda-forge python-graphviz and conda install -c anaconda graphviz. To all of these commands I get the same cuda error.

Can anyone give a hand? Thanks a lot.