Ubuntu 12.10 not using current Kernel

Question

When performing the sequence of commands:

sudo update-grub

Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-3.5.0-25-generic
Found kernel: /boot/vmlinuz-3.5.0-24-generic
Found kernel: /boot/vmlinuz-3.5.0-23-generic
Found kernel: /boot/vmlinuz-3.2.0-37-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done

uname -r

3.5.0-23-generic

sudo apt-get -V install linux-generic linux-image-generic linux-headers-generic

Reading package lists... Done
Building dependency tree
Reading state information... Done 
linux-generic is already the newest version. 
linux-headers-generic is already the newest version.
linux-image-generic is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

I am learning about Linux refreshing up on my knowledge, and assistance would be greatly appreciated.

Answer 1

I do not see anything wrong with any of those commands.

To use the most current kernel you need to reboot. The newest kernel will be the most recent and selected by default. You can select other, older kernels or other OS from the grub (boot) menu.

Ths last line, about one package not being upgraded, can almost certailny be fixed with:

sudo apt-get dist-upgrade

Answer 2

I have a dual boot system with Ubuntu and Windows 7. I forgot that I installed Linux Mint Nadia 14 Meta into virtual box; because my external hard drive was producing an [errno 5]Input/Ouput error, that it was outdated or the read/write spend needed to be increased.I did not get around to troubleshooting that issue, so I install the virtual machine on my internal hard drive.
After trying your command it jogged my memory, sudo apt-get dist-upgrade, so I booted into Windows 7 and started virtualbox. When loading Linux Mint performing...
uname -r
3.5.0-25-generic
I remember cleaning the grub and removing 3.5.0-24-generic. I cleaned the grub.cfg and menu.lst in Ubuntu and rebooted. Plus booted back into Windows 7 and loaded Linux Mint to see if it would load, no issue so far.

Finally I booted back into Ubuntu and I haven't seen any issue so far. I would not know why the correlation between my virtualbox image and Ubuntu; especially, when in the advance options of the grub during boot it only shows the current kernels that are installed in Ubuntu....

Found kernel: /boot/vmlinuz-3.5.0-23-generic
Found kernel: /boot/vmlinuz-3.2.0-37-generic
Found kernel: /boot/memtest86+.bin

Thanks for you prompt to answers and I do appreciate the assistance.