Connecting Ubuntu Hyper-V instance to Wifi adapter on XPS13 9350 running Windows 10 Pro

Dear All (anybody)...

I'm very sorry to say this is driving me crazy. The Windows 10 Pro Hyper-v UI on my XPS 13 is fine for installing an Ubuntu 16.04.01 instance as a VM, very straight forward in fact. But when trying to connect the VM instance to the Broadcom Wifi via a virtual switch all options seem to go pear shaped.

I've tried external, internal & private switch connections from the UI & PowerShell, none seem to work. Feedback is minimal from the UI. From the PowerShell (as Administrator) when I try to connect the wifi via an external virtual switch, which I think is what I want to do, I get the following from the command line;

PS C:\WINDOWS\system32>$net = Get-NetAdapter -Name 'Wi-Fi'

PS C:\WINDOWS\system32> New-VMSwitch -Name "External VM Switch" -AllowManagementOS $True -NetAdapterName $net.Name

New-VMSwitch : Failed while adding virtual Ethernet switch connections.
Ethernet port '{57C955F7-E5F2-416A-91A8-ABA93AE5C469}' bind failed: Catastrophic failure (0x8000FFFF).
At line:1 char:2
+ New-VMSwitch -Name "External VM Switch" -AllowManagementOS $True -Ne ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [New-VMSwitch], VirtualizationException
+ FullyQualifiedErrorId : OperationFailed,Microsoft.HyperV.PowerShell.Commands.NewVMSwitch

I get something similar in the Hyper-V UI but the messaging is less helpful.

Private & internal switches just don't seem to work. I have followed Hyper-V & online instructions & Ubuntu just doesn't pick up the wifi.

Any thoughts anyone?

T.