Re: A further question on my "how to move to an NVME disk" question

[Pascal Hambourg]

Le 21/11/2019 à 20:46, Chris Green a écrit :
> However trying to boot 19.10 from /dev/nvme0n1p2 fails with "No such
> device c6ca1c2d-4837-48b9-8fa6-1ef47251d7b7" whereas booting it from
> /dev/sda1 (a spare SATA spinning disk) boots OK.  The device UUID is
> correct for /dev/nvme0n1p2 so I guess grub isn't able to read the NVME
> SSD for some reason.

Of course. GRUB uses the BIOS for disk access, but the BIOS cannot 
manage the NVMe SSD.

>  How do I get over *this* issue! :-)

As explained before : you must put Ubuntu 19.10's /boot in a location 
which the BIOS can see, such as the SATA SSD. But DO NOT share the same 
/boot between both Ubuntu's, else GRUB won't be able to tell which 
kernels belong to which system.