I recently upgraded from Ubuntu 9.10 to 10.04 and now my boot screen is a bit messy. Since I'm not using the latest GRUB boot kernel (Linux 2.6.32-28-generic), I might as well delete it. For more documentation, visit Ubuntu Forums.
Here's how you go about deleting the GRUB boot kernels.
Step 1 Open Synaptic Package Manager
Go to System > Administration > Synaptic Package Manager.
Click Search > Find and then type on the search window "Linux generic headers" and scroll down to see which one you need to remove.
Step 2 Mark for Removal
Mark linux-headers-2.6.32-28-generic for removal.
Step 3 Apply the Changes
Just click the "Apply" button and confirm the changes.
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