If you have been an Ubuntu for
sometime than you must have witnessed a Linux Kernel update. When you
update the Linux Kernel, the older version still stays in the system and
takes some of the disk storage. Apart from that it also cluttered Grub
boot menu (newer Grub are still cleaner as they group all the older
Linux Kernel together). But whatever may be the reason, if you want to
get rid of the older unused Linux kernel versions, follow this simple
tutorial:
First step is to know which Linux Kernel version is in use at present. To find out which Kernel version is used, type the following command in terminal:
uname -r
The output should contain something like 3.5.0-16-generic. This
number is my current Linux version. This kernel MUST NOT be deleted. In
fact, I would suggest you to keep at least one older version in case
you may need it.
Now, open Ubuntu Software Center. Search for linux-image. Don’t worry if there are no search results. At the bottom of the panel, click on Show XX technical items:
This will show you the list of Linux Kernels installed in your Ubuntu system. Select any of them and click on Remove to uninstall it.
And that is it. Update your Grub to refresh it by using the following command in terminal:
sudo update-grub
Just a reboot and we got rid of old Linux Kernel versions. Cheers 
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