$ sudo apt update
$ apt search openblas
$ sudo apt install libopenblas-dev
Then:
$ sudo update-alternatives --config libblas.so.3
Or:
sudo update-alternatives --remove libblas.so.3 /usr/lib/x86_64-linux-gnu/libopenblas.so.0
Go to your Python environment:
pip install scipy
pip install numpy
pip install --upgrade gensim