You won't get missing required dependency error messages if you install the Pandas, Numpy and Seaborn packages from the default Ubuntu repositories. To install the Python 3 versions of Pandas, Numpy and Seaborn in Ubuntu 16.04 and later open the terminal and type:
sudo apt install python3-pandas python3-numpy python3-seaborn
To install the Python 3 versions of Pandas and Numpy in Ubuntu 14.04 and later open the terminal and type:
sudo apt install python3-pandas python3-numpy
To install Seaborn in Ubuntu 14.04:
sudo apt install python3-pip
python3 -m pip install --user seaborn
It seems like a waste of time to install Seaborn with pip in Ubuntu 14.04, because Ubuntu 14.04 will reach End of Life in another two months. If you are using Ubuntu 14.04 this would be a good time to think about upgrading to Ubuntu 18.04.