$ sudo apt-get remove dv4l 

Uninstall dv4l including dependent package

If you would like to remove dv4l and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove dv4l 

Use Purging dv4l

If you use with purge options to dv4l package all the configuration and dependent packages will be removed.

$ sudo apt-get purge dv4l 

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 dv4l 

See Also,