sudo apt-get install linux-source :
Code:
Unpacking linux-source-3.2.0 (from .../linux-source-3.2.0_3.2.0-32.51_all.deb) ...
Selecting previously unselected package linux-source.
Unpacking linux-source (from .../linux-source_3.2.0.32.35_all.deb) ...
Setting up linux-source-3.2.0 (3.2.0-32.51) ...
Setting up linux-source (3.2.0.32.35) ...
File list : $ dpkg -L linux-source-3.2.0
'-32.51'
http://packages.ubuntu.com/source/precise/linux
The build / update '-23' that you have is a 6 month old version :
The relase version → No security updates.
Older versions ...
linux-source-3.2.0_3.2.0-23.36_all.deb 11-Apr-2012
linux-source-3.2.0_3.2.0-24.38_all.deb 02-May-2012
linux-source-3.2.0_3.2.0-24.39_all.deb 22-May-2012
linux-source-3.2.0_3.2.0-25.40_all.deb 25-May-2012
linux-source-3.2.0_3.2.0-26.41_all.deb 15-Jun-2012
linux-source-3.2.0_3.2.0-27.43_all.deb 07-Jul-2012
linux-source-3.2.0_3.2.0-29.46_all.deb 28-Jul-2012
linux-source-3.2.0_3.2.0-30.48_all.deb 25-Aug-2012
linux-source-3.2.0_3.2.0-31.50_all.deb 07-Sep-2012
http://dk.archive.ubuntu.com/ubuntu/pool/main/l/linux/
.