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Problems installing grub during buster d-i of a machine with only NVMe storage

Hi,

I have a machine whose only storage is NVMe and I think this forces
me to use EFI if I want to boot it. This is something I've never
done before as I've always got by with the BIOS set to legacy boot.
It's not going well but I don't know if that is due to something I'm
doing wrong.

At the point where d-i asks me if I want to install an extra copy of
grub in the EFI fallback location, I say "yes" and then get an error
screen saying:

    Unable to install GRUB in dummy

    Executing 'grub-install dummy' failed.

    This is a fatal error.

Here are the logs from that install attempt:

https://strugglers.net/~andy/tmp/d-i/

Having experienced this problem when trying to do my "real" install
(largely preseed automated, software RAID, LVM), I did this one
non-automated with priority set to "low" and made it much simpler:
only used /dev/nvme0n1; three partitions (ESP, swap and root). That
is why the logs show me deleting an MD device as the first thing I
do in partman. It seems to have been left over from my earlier
attempts.

If I say "no" to the extra copy of grub I get the same error, so I
think it's not that step but the actual grub-install that comes
after.

I guess the only interesting part of the syslog file is:

Nov 21 01:02:01 grub-installer: info: Installing grub on 'dummy'
Nov 21 01:02:01 grub-installer: info: grub-install does not support --no-floppy
Nov 21 01:02:25 grub-installer: info: Running chroot /target grub-install  --force-extra-removable --force "dummy"
Nov 21 01:02:25 grub-installer: Installing for x86_64-efi platform.
Nov 21 01:02:25 grub-installer: grub-install: warning: vars_get_variable: open(/sys/firmware/efi/vars/blk0-47c7b225-c42a-11d2-8e57-00a0c969723b/raw_var, O_RDONLY) failed: No such file or directory.
Nov 21 01:02:25 grub-installer: grub-install: warning: efi_get_variable: ops->get_variable failed: No such file or directory.
Nov 21 01:02:25 grub-installer: grub-install: warning: device_get: readlink of /sys/block/(null)/device failed: No such file or directory.
Nov 21 01:02:25 grub-installer: grub-install: warning: open_disk: could not open disk: No such file or directory.
Nov 21 01:02:25 grub-installer: grub-install: warning: efi_va_generate_file_device_path_from_esp: could not open disk: No such file or directory.
Nov 21 01:02:25 grub-installer: grub-install: warning: efi_generate_file_device_path_from_esp: could not generate File DP from ESP: No such file or directory.
Nov 21 01:02:25 grub-installer: grub-install: error: failed to register the EFI boot entry: No such file or directory.
Nov 21 01:02:25 grub-installer: error: Running 'grub-install  --force-extra-removable --force "dummy"' failed.

Is this bug report relevant? https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925591

Though it seems to be about software RAID, whereas I've striped the
example down to only having one ESP.

There's also this one with the same error messages:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=933523

But trying some ideas from there results in:

~ # ls -la /sys/firmware/efi/efivars/
dr-xr-xr-x    2 root     root             0 Nov 21 00:46 .
drwxr-xr-x    6 root     root             0 Nov 21 00:46 ..
~ # mount -t efivarfs efivarfs /sys/firmware/efi/efivars
~ # mount --rbind /sys /target/sys
~ # chroot /target /bin/bash
root@tanqueray:/# grub-install
Installing for x86_64-efi platform.
grub-install: warning: efivarfs_get_variable: open(/sys/firmware/efi/efivars/blk0-47c7b225-c42a-11d2-8e57-00a0c969723b): No such
 file or directory.
grub-install: warning: efi_get_variable: ops->get_variable failed: No such file or directory.
grub-install: warning: device_get: readlink of /sys/block/(null)/device failed: No such file or directory.
grub-install: warning: open_disk: could not open disk: No such file or directory.
grub-install: warning: efi_va_generate_file_device_path_from_esp: could not open disk: No such file or directory.
grub-install: warning: efi_generate_file_device_path_from_esp: could not generate File DP from ESP: No such file or directory.
grub-install: error: failed to register the EFI boot entry: No such file or directory.
root@tanqueray:/# efibootmgr -v
BootCurrent: 0009
Timeout: 5 seconds
BootOrder: 0007,0009,000A,0003
Boot0003* UEFI: Built-in EFI Shell      VenMedia(5023b95c-db26-429b-a648-bd47664c8012)..BO
Boot0007* debian        HD(1,GPT,4f823ade-7a2d-4d65-b369-f76f3dd01aa8,0x800,0xf3800)/File(\EFI\DEBIAN\GRUBX64.EFI)..BO
Boot0009* (B1/D0/F0) UEFI: PXE IPv4 Intel(R) I350 Gigabit Network Connection(MAC:3cecef2221e8)  PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/MAC(3cecef2221e8,1)/IPv4(0.0.0.00.0.0.0,0,0)..BO
Boot000A* (B1/D0/F1) UEFI: PXE IPv4 Intel(R) I350 Gigabit Network Connection(MAC:3cecef2221e9)  PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x1)/MAC(3cecef2221e9,1)/IPv4(0.0.0.00.0.0.0,0,0)..BO

Any ideas?

Cheers,
Andy
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