We need an option to remove old kernels after a successful update.

When somebody has multiple versions of Ubuntu (Or Windows) installed on one or more hard drives grub gets a giant list of kernels. Which gets larger after each kernel update. I think there should be a more user friendly solution to remove them without having to install any additional software such as Ubuntu Tweak. I believe a message should pop up after booting into a new kernel stating "It looks like you have successfully booted into a new kernel update! Would you like to remove the unwanted old kernels from your system (104MB will be freed)" This type of task shouldn't be hard to implement, but would be very useful for the new comers who don't want to read a dictionary to run Ubuntu effectively. :)