$ sudo apt-get update
$ sudo apt-get install python-mpltoolkits.basemap-dat

python-mpltoolkits.basemap-dat is installed in your system.

Make ensure the python-mpltoolkits.basemap-dat package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-mpltoolkits.basemap-dat*

You will get with python-mpltoolkits.basemap-dat package name, version, architecture and description in a table

python-mpltoolkits.basemap-dat package basic information: