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

[Chris Green]

On Thu, Nov 21, 2019 at 09:51:03PM +0100, Pascal Hambourg wrote:
> 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.
> 
OK, yes, I see.  So I need to put the /boot for /dev/nvme0n1p2 on
/dev/sda1 or similar.  How does one configure that though?  I.e. if I
clear out my 'spare' /dev/sda1 and just put a /boot on it how do I
tell update-grub to configure grub so that the /boot is on /dev/sda1
but the rest of the OS is on /dev/nvme0n1p2?

-- 
Chris Green