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I've set up an instance of Ubuntu 12.04.1 LTS under Hyper-V 2012. However it seems to be nondeterministic as to whether or not it completes the boot process.

I get a Kernel Panic, "IO-APIC + timer doesn't work!", which from my research is caused by not having integration services correctly installed?

It was my understanding that the integration services were all now baked into the kernel? It should then be fine to update the OS (including any kernel updates, as I'm guessing that's what has happened)

Being able to rely on this successfully booting would be great as I intend on using ssh for crisis situations.

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Yes, Ubuntu 12.04 LTS has built in hyper-v support and should "just work" under Hyper-V. I've run it under Hyper-V 2008 R2 for some time. Even prior to this 10.04 LTS worked fairly well. I think the factor will be elsewhere, such as hardware or driver support of hardware you're running Hyper-V 2012 on. Do all your other VMs work fine? I'm curious if you ever found the true cause ... have any other details on your setup? I just setup some test VM installs of 12.04LTS 32-bit & 64-bit under Hyper-V 2012... – Joshua McKinnon Dec 19 '12 at 4:52
No I haven't found the cause yet. It's running on a i5-3470 and I believe a Asus P8B75-M. All my Windows based VMs work flawlessly (Windows Server 2012, Windows Server 2008r2 and Windows 7) – Technicolour Dec 23 '12 at 18:48

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I've just managed to install Ubuntu Server 12.04.1 under Hyper-V 2012 without problems. So, Ubuntu definitively works (with certain settings).

I used the 64 bit version and installed a "minimal virtual machine" (in the CD boot screen under "Modes").

If this doesn't work, I would guess it's some issue with your CPU.

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