Comment 8 for bug 998742

I really have no idea about this...

If you want to clean old kernels, try to run this command under your terminal:

   sudo apt-get remove linux-headers-2.6.38-10 linux-headers-2.6.38-10-generic linux-headers-2.6.38-10-generic-pae linux-headers-2.6.38-11 linux-headers-2.6.38-11-generic linux-headers-2.6.38-11-generic-pae linux-headers-3.0.0-13 linux-headers-3.0.0-13-generic linux-headers-3.0.0-13-generic-pae linux-headers-3.0.0-14 linux-headers-3.0.0-14-generic linux-headers-3.0.0-14-generic-pae linux-headers-3.0.0-15 linux-headers-3.0.0-15-generic linux-headers-3.0.0-15-generic-pae linux-headers-3.0.0-16 linux-headers-3.0.0-16-generic linux-headers-3.0.0-16-generic-pae linux-headers-3.0.0-17 linux-headers-3.0.0-17-generic linux-headers-3.0.0-17-generic-pae linux-image-2.6.38-10-generic linux-image-2.6.38-10-generic-pae linux-image-2.6.38-11-generic linux-image-2.6.38-11-generic-pae linux-image-2.6.38-8-generic linux-image-2.6.38-8-generic-pae linux-image-3.0.0-12-generic linux-image-3.0.0-12-generic-pae linux-image-3.0.0-13-generic linux-image-3.0.0-13-generic-pae linux-image-3.0.0-14-generic linux-image-3.0.0-14-generic-pae linux-image-3.0.0-15-generic linux-image-3.0.0-15-generic-pae linux-image-3.0.0-16-generic linux-image-3.0.0-16-generic-pae linux-image-3.0.0-17-generic linux-image-3.0.0-17-generic-pae