Ubuntu 20.04 Installation does not detect Windows 10 is already installed

[Behrang Saeedzadeh]

Hi

I wanted to install Ubuntu 20.04 next to Windows 10 (on 2 different NVMe
SSDs) but the Ubuntu installer is not detecting that Windows 10 is already
installed and does not show the option for a dual-boot installation (
https://imgur.com/a/Bprq2Jw -- copied from
https://www.tecmint.com/install-ubuntu-alongside-with-windows-dual-boot/).

My BIOS/UEFI settings are shown here: https://imgur.com/a/4UevIlz (images 1
to 4).

Image 5 shows Windows Disk Manager's view of the drives.

Images 6 and 7 show Rufus settings used for burning the Ubuntu ISO onto a
USB stick.

Images 8 and 7 show Ubuntu Live's view of the disks.

The last image shows the "Installation type" screen where I was expecting
to see the option to install Ubuntu alongside Windows 10, but that option
does not show.

On the live media, lsblk detects both NVMe drives:

ubuntu at ubuntu:~$ lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0         7:0    0   1.9G  1 loop /rofs
loop1         7:1    0  27.1M  1 loop /snap/snapd/7264
loop2         7:2    0    55M  1 loop /snap/core18/1705
loop3         7:3    0 240.8M  1 loop /snap/gnome-3-34-1804/24
loop4         7:4    0  62.1M  1 loop /snap/gtk-common-themes/1506
loop5         7:5    0  49.8M  1 loop /snap/snap-store/433
sda           8:0    1   7.5G  0 disk
└─sda1        8:1    1   7.5G  0 part /cdrom
sdb           8:16   0 119.2G  0 disk
└─sdb1        8:17   0 119.2G  0 part
+---------------------------------------+
| nvme0n1     259:0    0   477G  0 disk |
+---------------------------------------+
├─nvme0n1p1 259:1    0   100M  0 part
├─nvme0n1p2 259:2    0    16M  0 part
├─nvme0n1p3 259:3    0 476.3G  0 part
└─nvme0n1p4 259:4    0   505M  0 part
+---------------------------------------+
| nvme1n1     259:5    0 953.9G  0 disk |
+---------------------------------------+
ubuntu at ubuntu:~$


Any idea what could be causing this and if somehow I can make Ubuntu
recognize that Windows 10 is already installed to offer an option to setup
dual boot?


-- 
Best regards,
Behrang Saeedzadeh
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