• vedi che kernel stai usando
    uname -r

  • lista dei kernel nel grub
    ls /boot/ | grep initrd

  • diventa root
    sudo -s
    apt-get -s remove linux-image-2.6.35-22-generic
    apt-get remove --purge linux-image-2.6.35-22-generic

Per il kernel 3.x:

sudo apt-get remove $(dpkg -l|awk '/^ii  linux-image-/{print $2}'|sed 's/linux-image-//'|awk -v v=`uname -r` 'v>$0'|sed 's/-generic//'|awk '{printf("linux-headers-%snlinux-headers-%s-genericnlinux-image-%s-genericn",$0,$0,$0)}')