I am using the Ubuntu 10.04 build and I created a repository upgrading to the 10.04 32-44 pae kernal and it seems to work find except for the vmxnet driver will not provide a perm address that is required by our software. Switching to an e1000 driver fixes that. I also was able to update to the new kernal in the post installation script utilizing these lines which removed the extra 2.6.32-38 kernal.
apt-get install linux-headers-2.6.32-43-generic-pae
apt-get install linux-image-2.6.32-43-generic-pae
apt-get purge -y .*2.6.32-38-generic
Creating a repository also works
This script downloads the 188.8.131.52 kernal which also works. just run it from a temp directory and copy the files over to a repository you make up in studio. If you go that way, you probably still want to use the apt-get purge command to clean out the old kernal.
sed 's/^deb-src/# deb-src/' -i /etc/apt/sources.list
aptitude -y update
aptitude -q -R --schedule-only purge ~i
aptitude -q -R --schedule-only download $Kernal_pkgs
aptitude -y download