ls -as /boot
total 221839
    4 .                               140 config-3.0.0-14-generic-pae         176 memtest86+_multiboot.bin              2 vmcoreinfo-3.0.0-15-generic-pae
    4 ..                              140 config-3.0.0-15-generic-pae        1700 System.map-2.6.32-34-generic-pae      2 vmcoreinfo-3.0.0-16-generic-pae
  645 abi-2.6.32-34-generic-pae       140 config-3.0.0-16-generic-pae        1841 System.map-2.6.35-30-generic-pae      2 vmcoreinfo-3.0.0-17-generic-pae
  698 abi-2.6.35-30-generic-pae       140 config-3.0.0-17-generic-pae        2115 System.map-2.6.38-12-generic-pae      2 vmcoreinfo-3.0.0-19-generic-pae
  727 abi-2.6.38-12-generic-pae       140 config-3.0.0-19-generic-pae        2141 System.map-3.0.0-12-generic-pae       2 vmcoreinfo-3.0.0-20-generic-pae
  727 abi-3.0.0-12-generic-pae        140 config-3.0.0-20-generic-pae        2141 System.map-3.0.0-13-generic-pae    4092 vmlinuz-2.6.32-34-generic-pae
  727 abi-3.0.0-13-generic-pae          5 grub                               2143 System.map-3.0.0-14-generic-pae    4347 vmlinuz-2.6.35-30-generic-pae
  727 abi-3.0.0-14-generic-pae      10773 initrd.img-2.6.32-34-generic-pae   2146 System.map-3.0.0-15-generic-pae    4567 vmlinuz-2.6.38-12-generic-pae
  727 abi-3.0.0-15-generic-pae      13619 initrd.img-2.6.35-30-generic-pae   2147 System.map-3.0.0-16-generic-pae    4675 vmlinuz-3.0.0-12-generic-pae
  727 abi-3.0.0-16-generic-pae      15365 initrd.img-2.6.38-12-generic-pae   2147 System.map-3.0.0-17-generic-pae    4676 vmlinuz-3.0.0-13-generic-pae
  727 abi-3.0.0-17-generic-pae      16481 initrd.img-3.0.0-12-generic-pae    2148 System.map-3.0.0-19-generic-pae    4681 vmlinuz-3.0.0-14-generic-pae
  727 abi-3.0.0-19-generic-pae      16487 initrd.img-3.0.0-13-generic-pae    2149 System.map-3.0.0-20-generic-pae    4698 vmlinuz-3.0.0-15-generic-pae
  761 abi-3.0.0-20-generic-pae      16501 initrd.img-3.0.0-14-generic-pae       2 vmcoreinfo-2.6.32-34-generic-pae   4700 vmlinuz-3.0.0-16-generic-pae
  115 config-2.6.32-34-generic-pae  16476 initrd.img-3.0.0-15-generic-pae       2 vmcoreinfo-2.6.35-30-generic-pae   4700 vmlinuz-3.0.0-17-generic-pae
  128 config-2.6.35-30-generic-pae  16481 initrd.img-3.0.0-16-generic-pae       2 vmcoreinfo-2.6.38-12-generic-pae   4703 vmlinuz-3.0.0-19-generic-pae
  136 config-2.6.38-12-generic-pae  16478 initrd.img-3.0.0-17-generic-pae       2 vmcoreinfo-3.0.0-12-generic-pae    4705 vmlinuz-3.0.0-20-generic-pae
  140 config-3.0.0-12-generic-pae      12 lost+found                            2 vmcoreinfo-3.0.0-13-generic-pae
  140 config-3.0.0-13-generic-pae     174 memtest86+.bin                        2 vmcoreinfo-3.0.0-14-generic-pae