1. First thing to do is find out the current version of the Linux kernel you’re using. Open a terminal and type in the following command uname -r
2. It will display the Linux kernel version you are using which should look something like this: 2.6.31-20-generic. (Take note of that number, you’ll need it for later)
3. Open the Synaptic Package Manager. Click on System > Administation > Synaptic Package Manager
4. On the “Quick search” box, type in linux-image.
5. It will list all available and installed Linux kernels. Look for those that have a green box on it (A green box indicates an installed package). To make it easier to find the packages, click on the column above the boxes to sort them and group them together.
6. Remember the Linux kernel version you got from Step #2? Find that package and make sure you don’t remove/uninstall it. Also, don’t remove the “linux-image-generic” package.
7. Now, find the other older versions of Linux kernels that you want to remove (Packages that have “linux-image-2.6.*”) and uninstall them. Do that by clicking on the box and select “Mark for Removal“.
8. Click on the “Apply” button to complete the process.
That’s it. Reboot your computer and check the Grub boot menu. It should be shorter and clean from old Linux kernels that you no longer need.
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