History : I had two NVMe drives connected & was having issues so decided to get rid of the one that had windows on it.
Removed it from the system. Rebooted into Manajro, updated grub & got this:
Generating grub configuration file ... Found theme: /usr/share/grub/themes/manjaro/theme.txt Found linux image: /boot/vmlinuz-4.19-x86_64 Found initrd image: /boot/amd-ucode.img /boot/initramfs-4.19-x86_64.img Found initrd fallback image: /boot/initramfs-4.19-x86_64-fallback.img Found memtest86+ image: /boot/memtest86+/memtest.bin
Followed by this warning
/usr/bin/grub-probe: warning: unknown device type nvme0n1. done
Manjaro is on nvme0n1. So…fix or ignore? I have rebooted & everything went OK.