$ sudo apt-get remove libgecode36 

Uninstall libgecode36 including dependent package

If you would like to remove libgecode36 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libgecode36 

Use Purging libgecode36

If you use with purge options to libgecode36 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libgecode36 

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 libgecode36 

See Also,