When each OS is on a separate drive I prefer completely independent installs. No shared boot loader, and the OS is chosen at boot time via the F12 boot menu.
I'd install the 2nd drive, pull the 1st drive (to be absolutely sure I knew where grub was going) and install Ubuntu. Then I'd put drive 1 back in and enjoy.
As I said, with that setup you'd use F12 to select the OS. This will require turning off fast startup in Windows, or always doing a full shutdown (SHIFT + shutdown) when leaving Windows. Otherwise you won't get an F12 option at startup.
BTW, I'd make windows recovery media before doing anything 
Z.
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@lenovotv wrote:
Thank you. That sounds like a very good idea! What do you mean by "make windows recovery media"? What is that for?
Am I correct that while I am still under Windows, I should get the installer for Ubuntu into a usb stick first before I take out the original ssd?
Windows recovery media is a flash drive that can be used to reinstall Windows. It will take a machine back to out-of-box state (+ any OS updates that have happened before the media is made). It's used for disaster recovery or when installing to a new drive. Not something you need for this project ... just someting that you (IMNSHO) need
It's probably easiest to build the Ubuntu installer while still running windows. There is a tutorial @ Ubuntu about how to do that, but here's how I'd do it: Download the 18.04 (or whatever) ISO and verify the checksum. Open the ISO with Windows Explorer (no other tool is required as it was in the old days) and copy the contents of the ISO to a FAT32-formatted flash drive. That's all you need for UEFI-bootable media.
Before cracking the machine open it's probably a good idea to verify that the media works. On a RESTART, or a startup after a full shutdown (SHIFT + shutdown), you should be able to hit F12 and boot the flash drive. It will take you to a live Ubuntu desktop - hopefully, barring X1X vs Ubuntu compatibility issues.
The contents of the flash drive should look like the below. This is 18.04.1. It's not literally a DVD drive in spite of what it says. It's sort of a virtual drive that Win Explorer creates out of the ISO. Files can be copied from there to the flash drive.
Good luck,
Z.
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In my experience there's nothing special needed when leaving Linux. Just a normal shut down.
SHIFT + shutdown or a restart are needed to make sure Windows is really shut down (not in what windows considers shut down which is more like hibernation) before switching operating systems. You can avoid that requirememt by turning off fast startup. It makes starting windows a little slower but with that fast machine with an SSD main drive it probably won't amount to much.
I just put 18.04.1 on my test crate today. That makes 4 versions of windows, 2 Solaris, and 10 or so Linux on the same machine. I definitely have fast startup turned off
Z.
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Hard to say with certainty but my guess as to Q5 is yes. My approach to this exercise was to encourage you to keep the booting of the two OSen separate. Looks like Tuxboot, or maybe a software update on the Ubuntu side if you did that, has mingled them.
Q6: maybe. What I don't know is how to clean the boot entries out of the UEFI boot menu. It's also possible that Windows will no longer boot w/the 2nd SSD removed. The presence of the Win boot manager in the menu gives me hope...
You might first try pulling the Ubuntu SSD and see if Windows still boots.
Sorry I can't give better direction. This isn't something I've ever had to unravel. At this point it might be a good idea to take these questions to the Linux forum. You can post there, or I can move your last post, or it can stay here - as you wish.
PCI LAN is presumably the PXE boot option. Whether that's what it is called these days or whether it's been renamed by Tuxboot, I can't say.
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.
The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog
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