$ sudo apt-get remove partman-nbd 

Uninstall partman-nbd including dependent package

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

$ sudo apt-get remove --auto-remove partman-nbd 

Use Purging partman-nbd

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

$ sudo apt-get purge partman-nbd 

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 partman-nbd 

See Also,