$ sudo apt-get remove libkml-java 

Uninstall libkml-java including dependent package

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

$ sudo apt-get remove --auto-remove libkml-java 

Use Purging libkml-java

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

$ sudo apt-get purge libkml-java 

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 libkml-java 

See Also,