Since this was top result when I tried to find an answer, I'm posting my own solution, even though it's 6+ years since question. The installing and migration for this particular server (it's a Gitlab server running on Ubuntu 14.04) is pretty cumbersome and we'd prefer not to reinstall and migrate if at all possible.
We have upgraded to a 2012 R2 host and can run Gen2 now, but every source I've found says you have to reinstall linux for it (I haven't been able to figure out why, but I'm sure there should be a reason). The original VM was running on a Windows Server 2008 host. I'm having some problems running on HyperV (machine stops responding for a while, etc.), that for the most part I've seen are greatly improved on Gen2 (we follow all Microsoft recommended practices for running Linux on Hyper-V but it's still not there, at least on Gen1). I know the Convert-VMGeneration cmdlet for PowerShell (this one: ) but that won't work with Linux VMs.
Is there any way I can easily (and without reinstalling) convert a Linux Hyper-V (gen 1) VM to a gen2 one?
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