$ sudo apt-get remove jblas 

Uninstall jblas including dependent package

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

$ sudo apt-get remove --auto-remove jblas 

Use Purging jblas

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

$ sudo apt-get purge jblas 

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 jblas 

See Also,