Q:

Ubuntu 18.04 Dual Boot with Windows 10 not detecting partition

I am trying to Install Ubuntu 18.04 so I can dual boot with my current Windows 10.
I have followed the instructions I have found online, but I get to the point where I need to select a disk partition, but it doesn't see anything.
Partitions selection screen
I have created 100GB of unallocated space where I want to put Ubuntu. My disk management looks like this:
Disk Management
I have disabled Secure Boot in my BIOS.
I have fixed the graphics issue with Nvidia by adding nomodeset to the grub file.
When I tried to use Gparted it only finds /dev/sda and can't find my unallocated space.
This is the Rufus confuration I used to make the Bootable USB.
Rufus Configuration
For reference this is on a Lenovo Legion Y740.
Edit: Added pictures of BIOS settings for Storage:
Storage Settings 1
Storage Settings 2
Any ideas?

A:

BIOS
Note: Have good backups before updating the BIOS
Note: Check I have the correct web page for your model #
Lenovo Legion Y740-15ICHg
You have BIOS version AVCN17WW(V1.07). The latest BIOS version is AVCN21WW(V1.11) and can be downloaded here.
Samsung SSD firmware
In Windows, download the Samsung Magician software here, and check your SSD firmware for an update.
Ubuntu install problem
Note: Have good backups before making these changes
You've got a single SSD set up in RAID mode, and the Ubuntu installer won't recognize your SSD until you switch your disk setting in the BIOS from RAID to AHCI.
Making that switch comes with some problems though, as Windows will no longer boot.
You don't need to reinstall Windows...
Below, you'll find two different ways to solve this problem. Some users found Choice #2 to be easier.
Make sure to have a backup of your important Windows files!
Choice #1: Looking at this article https://samnicholls.net/2016/01/14/how-to-switch-sata-raid-to-ahci-windows-10-xps-13/ will show you how to make the change without having to reinstall Windows.

Boot to Windows with your current SATA controller configuration
Open Device Manager
Expand Storage Controllers and identify the Intel SATA RAID Controller
View properties of the identified controller
On the Driver tab, click the Update driver… button
Browse my computer…, Let me pick…
Uncheck Show compatible hardware
Select Microsoft as manufacturer
Select Microsoft Storage Spaces Controller as model #
Accept that Windows cannot confirm that this driver is compatible
Save changes, reboot to BIOS and change RAID SATA Controller to AHCI
Save changes and reboot normally, hopefully to Windows

Now you should be able to install Ubuntu in a dual-boot configuration.
Choice #2: See http://triplescomputers.com/blog/uncategorized/solution-switch-windows-10-from-raidide-to-ahci-operation/

 Right-click the Windows Start Menu. Choose Command Prompt (Admin).
 If you don’t see Command Prompt listed, it’s because you have already been updated to a later version of Windows.  If so, use this method instead to get to the Command Prompt:
 -  Click the Start Button and type cmd
 - Right-click the result and select Run as administrator
Type this command and press ENTER: bcdedit /set {current} safeboot minimal
 - If this command does not work for you, try bcdedit /set safeboot minimal
Restart the computer and enter BIOS Setup (the key to press varies between systems).
Change the SATA Operation mode to AHCI from either IDE or RAID (again, the language varies).
Save changes and exit Setup and Windows will automatically boot to Safe Mode.
Right-click the Windows Start Menu once more. Choose Command Prompt (Admin)
Type this command and press ENTER: bcdedit /deletevalue {current} safeboot
 - If you had to try the alternate command above, you will likely need to do so here also: bcdedit /deletevalue safeboot
Reboot once more and Windows will automatically start with AHCI drivers enabled.

