$ sudo apt-get remove fiona 

Uninstall fiona including dependent package

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

$ sudo apt-get remove --auto-remove fiona 

Use Purging fiona

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

$ sudo apt-get purge fiona 

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 fiona 

See Also,