$ sudo apt-get remove libblacs-mpich1 

Uninstall libblacs-mpich1 including dependent package

If you would like to remove libblacs-mpich1 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libblacs-mpich1 

Use Purging libblacs-mpich1

If you use with purge options to libblacs-mpich1 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libblacs-mpich1 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove libblacs-mpich1 

See Also,