You didn't mention which version of Windows you're trying to boot up.
There's a couple discussions that cover the switch. One of them sounds like a situation similar to your own. IT's a wall of text for an explanation but perhaps you can glean something from the advice:
DZ68DB: change AHCI...
For Ubuntu 14.04 it seems like it's already well integrated:
Ubuntu virtual machines on Hyper-V
Applies To: Hyper-V Server 2012, Hyper-V Server 2012 R2, Windows 8, Windows 8.1, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2
Ubuntu virtual machines on Hyper-V
Dynamic memory...
Feature Descriptions for Linux virtual machines on Hyper-V
Applies To: Hyper-V Server 2012, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2
Linux Virtual Machines on Hyper-V
Depends on the version of Windows Server/Hyper-V and Linux Guest OS. They've got a pretty verbose...
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