Possible Duplicate:
Is there a way to remove/hide old kernel versions?
I upgraded my Ubuntu 11.10 system to 12.04 using a CD. After upgrading I try to remove old version kernels that appeared in grub boot menu, using the Synaptic Package Manager. But old kernel packages (example: linux-image 3.0.0-16-generic) do not appear in Synaptic. When I try to update GRUB, I see the kernels there. How can I remove them properly?
