Yes I tried to turn off the NVme drives as I expected this to be the problem. However I didn't find any setting in my Asus BIOS. Last time I removed a NVme drive I lost the screw.
One other problem might have been that I'm using lvm on Ubuntu 19.10 installed on the 500 GB Nvme disk
The installation of W10 on the 250GB NVme disk went OK, but I saw a message from the W10 installer about a repaired disk. All boot files, Ubuntu 19.10, Ubuntu 20.04 and W10, are stored the 500 GB NVme disk. The grub menu was built OK during the installation of Ubuntu 20.04 and boot to the three systems works as expected.
Code:
p-i@pi-Asus-B450-F:~$ sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL
NAME FSTYPE SIZE MOUNTPOINT LABEL
loop0 squashfs 91,4M /snap/core/8689
loop1 squashfs 54,7M /snap/core18/1668
loop2 squashfs 47,7M /snap/snap-store/295
loop3 squashfs 44,9M /snap/gtk-common-themes/1440
loop4 squashfs 163,7M /snap/spotify/41
loop5 squashfs 221,4M /snap/gnome-3-34-1804/18
sda 232,9G
├─sda1 vfat 512M
└─sda2 ext4 232,4G /
sr0 1024M
nvme0n1 447,1G
├─nvme0n1p1 vfat 512M /boot/efi
└─nvme0n1p2 LVM2_member 446,6G
├─vgubuntu-root ext4 445,7G
└─vgubuntu-swap_1 swap 980M
nvme1n1 232,9G
├─nvme1n1p1 16M
└─nvme1n1p2 ntfs 232,9G
p-i@pi-Asus-B450-F:~$
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