I have a dual-boot Ubuntu 17.10/Windows 10 machine. They all reside on a 512GB NVMe SSD and GRUB is installed as main bootloader (GPT partition table).
From Windows 10, I now want to boot the Ubuntu install, so I created a "virtual" NVMe disk in VMWare Workstation that uses the physical Ubuntu EXT4 partition + the swap partition.
The problem is that the system does not boot as there is no bootloader.
So I created a proper virtual disk in VMWare where I was planning to install another GRUB instance (from a Live CD) to start the Ubuntu installation. The problem is that GRUB wants me to chroot to the existing install, while all I want is just to install another GRUB on the virtual disk.
Here is the VM configuration, the ticked boxes are the partitions used in VMWare Workstation.
Is this the correct way to proceed? What do I have to do to continue?
EDIT: Not a duplicate. I am not asking how to install GRUB. GRUB is already installed on the pysical DISK. But since I am using only some partitions of that very disk I need to install a copy of GRUB in ANOTHER VIRTUAL partition that has no OS, so definitely can't EITHER access to the already existing GRUB, NOR install it as I'd usually do from a Live CD.