I have encountered some issues when moving VMWare Linux hosts on newer kernels to AHV.
When moved they are unable to boot as expected, exhibiting hdd not found errors and fail out to a basic recovery kernel.
Best answer by Jon
As a general statement, there could be a few things going on here, especially with the new kernels on the Ubuntu side (like 16.04). We've fixed several of these compatibility issues in newer AHV and AOS releases.
Also, if you are using UEFI boot instead of BIOS on VMW, that will also cause similar issues, and requires a simple flag in ACLI to be set to switch the AHV side to UEFI instead of BIOS.
Those are the first two things that come to mind, but support can help you chase down the absolute truth