Graham, you can download linux-image-2.6.38-13-generic_2.6.38-13.52_amd64.deb or linux-image-2.6.38-13-generic_2.6.38-13.52_i386.deb (depends if you have an amd64 or i386 install) from http://archive.ubuntu.com/ubuntu/pool/main/l/linux/ if you want to install manually. After you install the .deb, you can choose to boot it from the grub menu.(choosing 2.6.38-13 entry). Yes, although not ideal, you can install the kernel and test on oneiric.
Graham, you can download linux-image- 2.6.38- 13-generic_ 2.6.38- 13.52_amd64. deb or linux-image- 2.6.38- 13-generic_ 2.6.38- 13.52_i386. deb (depends if you have an amd64 or i386 install) from http:// archive. ubuntu. com/ubuntu/ pool/main/ l/linux/ if you want to install manually. After you install the .deb, you can choose to boot it from the grub menu.(choosing 2.6.38-13 entry). Yes, although not ideal, you can install the kernel and test on oneiric.