$ sudo apt-get remove libdkim1d 

Uninstall libdkim1d including dependent package

If you would like to remove libdkim1d and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libdkim1d 

Use Purging libdkim1d

If you use with purge options to libdkim1d package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libdkim1d 

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 libdkim1d 

See Also,