Comment 16 for bug 151942

This is a similar problem I have:

This kernel requires the following features not present on the CPU:
0:6
Unable to boot - please use a kernel appropriate for you CPU.

Does this on Parallels 3 on my Intel Macbook. No problem with the other 32-bit editions of [U|K|X]buntu nor JeOS nor Studio. Enabling and disabling VT-X instructions doesn't change anything.

That's really fucking professional, guys. An LTS release for the /server/ that evidently wasn't tested enough. Shuttleworth should have given you a few more weeks like he did for 6.06. At the /least/ you should detect, during the installation process, whether the CPU supports these extra instructions that the -server kernel needs.