$ sudo apt-get remove emma 

Uninstall emma including dependent package

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

$ sudo apt-get remove --auto-remove emma 

Use Purging emma

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

$ sudo apt-get purge emma 

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 emma 

See Also,