$ sudo apt-get remove g15daemon 

Uninstall g15daemon including dependent package

If you would like to remove g15daemon and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove g15daemon 

Use Purging g15daemon

If you use with purge options to g15daemon package all the configuration and dependent packages will be removed.

$ sudo apt-get purge g15daemon 

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 g15daemon 

See Also,