$ sudo apt-get remove dealer 

Uninstall dealer including dependent package

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

$ sudo apt-get remove --auto-remove dealer 

Use Purging dealer

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

$ sudo apt-get purge dealer 

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 dealer 

See Also,