More detail: I have the following partitions:
The machine is a Dell XPS 15. Windows lives in /dev/nvme0n1p3, and Ubuntu in /dev/nvme0n1p7. From linux, I create a raw disk
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sudo VBoxManage internalcommands createrawvmdk -filename ~/VirtualBox_VMs/win10pro.vmdk -rawdisk /dev/nvme0n1 -partitions 1,2,3,4,5,6
I change the owner of the files to my regular user, so that VirtualBox can access them
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sudo chown $USER:$USER VirtualBox_VMs/win10pro*
- I launch VirtualBox 5.1.30_Ubuntu r118389
- Create a new VM named "Windows_10_Pro"
- Increase RAM to 8192 MB
- "Use an existing virtual hard disk file" -> ~/VirtualBox_VMs/win10pro.vmdk
- System -> Enable EFI (special OSes only)
- Display -> Enable 3D Acceleration
- Display -> Enable 2D Acceleration
- Display -> Video Memory = 256 MB
- Storage -> win10pro.vmdk -> Solid-state Drive
This was working before upgrading to Ubuntu artful. "Start" would just launch Windows 10. When I saw that it had stopped working, I deleted the VM, created a new one with the steps above, but I still get the GNU GRUB screen.
Although Windows 10 doesn't boot from VirtualBox anymore, I can launch it from the initial dual boot menu when I switch the laptop on. So Windows 10 hasn't broken, and works as before.
Any ideas?