$ sudo apt-get remove grml2usb 

Uninstall grml2usb including dependent package

If you would like to remove grml2usb and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove grml2usb 

Use Purging grml2usb

If you use with purge options to grml2usb package all the configuration and dependent packages will be removed.

$ sudo apt-get purge grml2usb 

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 grml2usb 

See Also,