I currently have Ubuntu 16.04 installed on my E580 thinkpad's 240 SSD. I want to clone my installation to an external 1Tb HDD and then replace ubuntu with Windows 10 on the SSD. The reason is that I need to run the 3D CAD software SolidWorks (SW) which only runs on Windows. I've currently installed Windows 10 and SW on an external USB 3.0 1TB HDD, but the result is quite laggy.

Using fdisk -l I've found the SSD to be /dev/nvme0n1 and the new HDD to be /dev/sda . As described here I've already tried cloning the SSD to HDD by booting from a Ubuntu live CD and then using dd if=/dev/nvme0n1 of=/dev/sda bs=64K conv=noerror,sync, but upon booting from the HDD I get a the grub terminal. I'm fairly new at this so I'm unsure what to do next. Any help would be appreciated.