Ubuntu 18 on VB 6 black screen blinking underscore

[Vibuncle]

Eventhough I found a lot of ppl have this problem I really didn't find a solution.
When I want to install Ubuntu, I start the machine and it is just showing black screen with blinking underscore.
Can anyone help?
Thanks

[socratis]

00:00:02.022625 VirtualBox VM 6.0.0 r127566 win.amd64 (Dec 18 2018 12:01:23) release log
00:00:02.203514 HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
00:00:02.267822 NEM: Adjusting APIC configuration from X2APIC to APIC max mode.  X2APIC is not supported by the WinHvPlatform API!
00:00:02.267826 NEM: Disable Hyper-V if you need X2APIC for your guests!
00:00:02.769034   HVP - Hypervisor Present (we're a guest) = 1 (1)
00:00:02.769184 Full Name: "Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz"

Here's what I think is going on. Mind you, this is really new functionality and we haven't learned how to read the "tea leaves" (logs) completely/accurately yet:

• You have an Intel CPU.
• Your host has Hyper-V enabled.
• VirtualBox tries to switch to the NEM mode. NEM (Native Execution Manager) utilizes Hyper-V as its back-end virtualization engine instead of the VirtualBox built-in one. This fails for a couple of reasons:
  • You have X2APIC enabled, which is not supported by Hyper-V.
  • You have an Intel CPU which does not yet support nested virtualization.

You need to disable all Hyper-V related application/services. Please go thoroughly through the FAQ: I have a 64bit host, but can't install 64bit guests. Remember that these are just guidelines, you have to use your judgement...

PS. For future reference you should ZIP your logs. It helps save a (virtual) tree or two...

[Vibuncle]

Thank you for your reply,
I don't really want to turn all the additional windows security features so it seems It have to suffice to install 32bit Ubuntu.
Anyway, thanks again, maybe this post helps anyone else with the same issue