I regularly delete old kernels leaving only the latest two entries using Synaptic.

I'm using Precise. However in my Grub "previous Linux version" menu there are quite a few entries labelled 2.6.8. I cannot find these linux-images in Synaptic.

dpkg -l | grep linux-image

Gives:

rc  linux-image-3.0.0-17-generic           3.0.0-17.30                         

    Linux kernel image for version 3.0.0 on x86/x86_64

ii  linux-image-3.2.0-27-generic           3.2.0-27.43

Linux kernel image for version 3.2.0 on 32 bit x86 SMP

ii  linux-image-3.2.0-29-generic           3.2.0-29.46

Linux kernel image for version 3.2.0 on 32 bit x86 SMP

ii  linux-image-3.4.0-030400-generic       3.4.0-030400.201205210521

Linux kernel image for version 3.4.0 on 32 bit x86 SMP

ii  linux-image-generic                    3.2.0.29.31

Generic Linux kernel image

Sudo update-grub gives:

Generating grub.cfg ...

Found linux image: /boot/vmlinuz-3.4.0-030400-generic

Found initrd image: /boot/initrd.img-3.4.0-030400-generic

Found linux image: /boot/vmlinuz-3.2.0-29-generic

Found initrd image: /boot/initrd.img-3.2.0-29-generic

Found linux image: /boot/vmlinuz-3.2.0-27-generic

Found initrd image: /boot/initrd.img-3.2.0-27-generic

Found linux image: /boot/vmlinuz-2.6.38-11-generic

Found initrd image: /boot/initrd.img-2.6.38-11-generic

Found linux image: /boot/vmlinuz-2.6.38-10-generic

Found initrd image: /boot/initrd.img-2.6.38-10-generic

Found linux image: /boot/vmlinuz-2.6.38-8-generic

Found initrd image: /boot/initrd.img-2.6.38-8-generic

Found memtest86+ image: /boot/memtest86+.bin

Found Windows Vista (loader) on /dev/sda1

sudo apt-get remove linux-image-2.6.8-8-generic gives:

E: Unable to locate package linux-image-2.6.8-8-generic

E: Couldn't find any package by regex 'linux-image-2.6.8-8-generic'

My boot folder contains the following:

abi-2.6.38-10-generic         initrd.img-3.4.0-030400-generic

abi-2.6.38-11-generic         memtest86+.bin

abi-2.6.38-8-generic          memtest86+_multiboot.bin

abi-3.2.0-27-generic          System.map-2.6.38-10-generic

abi-3.2.0-29-generic          System.map-2.6.38-11-generic

abi-3.4.0-030400-generic      System.map-2.6.38-8-generic

config-2.6.38-10-generic      System.map-3.2.0-27-generic

config-2.6.38-11-generic      System.map-3.2.0-29-generic

config-2.6.38-8-generic       System.map-3.4.0-030400-generic

config-3.2.0-27-generic       vmcoreinfo-2.6.38-10-generic

config-3.2.0-29-generic       vmcoreinfo-2.6.38-11-generic

config-3.4.0-030400-generic   vmcoreinfo-2.6.38-8-generic

extlinux                      vmlinuz-2.6.38-10-generic

grub                          vmlinuz-2.6.38-11-generic

initrd.img-2.6.38-10-generic  vmlinuz-2.6.38-8-generic

initrd.img-2.6.38-11-generic  vmlinuz-3.2.0-27-generic

initrd.img-2.6.38-8-generic   vmlinuz-3.2.0-29-generic

initrd.img-3.2.0-27-generic   vmlinuz-3.4.0-030400-generic

initrd.img-3.2.0-29-generic

and

ls -l /etc/grub.d

total 56

-rwxr-xr-x 1 root root 6715 Apr 17 20:16 00_header

-rwxr-xr-x 1 root root 5522 Oct  1  2011 05_debian_theme

-rwxr-xr-x 1 root root 7407 May 17 09:22 10_linux

-rwxr-xr-x 1 root root 6335 Apr 17 20:16 20_linux_xen

-rwxr-xr-x 1 root root 1588 May  3  2011 20_memtest86+

-rwxr-xr-x 1 root root 7603 Apr 17 20:16 30_os-prober

-rwxr-xr-x 1 root root  214 Oct  1  2011 40_custom

-rwxr-xr-x 1 root root   95 Oct  1  2011 41_custom

-rw-r--r-- 1 root root  483 Oct  1  2011 README

gdisk -l /dev/sda

yields:

Partition table scan:

  MBR: MBR only

  BSD: not present

  APM: not present

  GPT: not present





***************************************************************

Found invalid GPT and valid MBR; converting MBR to GPT format.

***************************************************************



Disk /dev/sda: 312581808 sectors, 149.1 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): F832A498-05E1-4615-B5B1-757ACB4A757A

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 312581774

Partitions will be aligned on 2048-sector boundaries

Total free space is 4183661 sectors (2.0 GiB)



Number  Start (sector)    End (sector)  Size       Code  Name

   1            2048        61442047   29.3 GiB    0700  Microsoft basic data

   3       163842048       169986047   2.9 GiB     8200  Linux swap

   4       169986048       312578047   68.0 GiB    0700  Microsoft basic data

   5        61444096       159666175   46.8 GiB    8300  Linux filesystem

Please help with removing the old and inexistent kernels from Grub.