$ sudo apt-get remove gkrellm-hdplop 

Uninstall gkrellm-hdplop including dependent package

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

$ sudo apt-get remove --auto-remove gkrellm-hdplop 

Use Purging gkrellm-hdplop

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

$ sudo apt-get purge gkrellm-hdplop 

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 gkrellm-hdplop 

See Also,