Do you have the Linux Hyperv Agent updated?
https://technet.microsoft.com/en-us/windows-server-docs/compute/hyper-v/supported-ubuntu-virtual-machines-on-hyper-v

@Tim_G from the get go Windows 10 does not include it. You can do an inplace upgrade from Windows 7 or 8.1 without an issue or losing data and settings. Meanwhile USMT also can do the job.

@bishnitro please see the link below:

https://techjourney.net/windows-easy-transfer-files-settings-to-windows-10-8-1-manual-install-or-free-pcmover/

@JaredBusch windows Easy Transfer works in Windows 10 but you got to copy some files from a good Windows 7 computer to make it work.

You can use ForensIT Tools:
https://www.forensit.com/downloads.html
https://www.forensit.com/move-computer.html