$ sudo apt-get remove libexplain51 

Uninstall libexplain51 including dependent package

If you would like to remove libexplain51 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libexplain51 

Use Purging libexplain51

If you use with purge options to libexplain51 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libexplain51 

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 libexplain51 

See Also,