Re: Grub-install fails with grub-install: error: disk `md0' not found.

[Pascal Hambourg]

Le 31/03/2018 à 12:13, Mark Syms a écrit :
> My system received a package update for grub from the distribution but
> as the package completed its update it failed (on all four drives)
> with the error in the subject line.

Which distribution ?

> System has 4 2TB drives in it, each with 3 partitions. Partition 1 is
> a bios boot partition, partition 2 is used in a 4 way RAID1 for /boot
> and partition 3 is used in a 4 way RAID5 array with LVM serving all
> the rest of the storage. (...)
>
> I've run grub-install with -v but that hasn't really given me any
> hints but if someone can point me at the important parts of the
> verbose log I'm happy to find and post snippets of it.

Can you post the full command line and output (without -v), along with 
the full output of cat /proc/mdstat and fdisk -l (on one disk) ?

I have made several installations with /boot on mdadm RAID with no 
problem, it is rather standard.