1. Shutdown VM and compress the compact the disks
2. Check if you have enough space: you need more or less the space of the VM disks+ minimal RAM configured
3. From your Hyper-V host, run PowerShell as an administrator and then run something like: GET-VM This will display all the VMs running on the current host.
4. Then run:

   $ExportPath = “C:\\Exports”
   Export-VM -Name “BoxNameFromGetVM Step3” -Path $ExportPath

    

On 2023 Ubuntu 18 LTS support will end, so I started to evaluate the next LTS release, Ubuntu 20.