Bug#932085: grub-common: Grub can't load initrd for Xen after upgrade to Buster

[Cameron Davidson]

I also had the same problem after upgrading from 9.9 to 10.1. (from
network repos 8 November 2019).

The symptoms were the same, on the video console, the message appeared
(not verbatim as I forgot to transcribe it)

 loading xen-4.11
 then the same old warning about no available console for the kernel
 loading linux-4.19.0-6   
 loading initrd...
 error writing to console (then nothing)

This is just as it appeared when booting Xen from EFI in Stretch, except
that the version numbers were updated.

Neither of the workarounds made any difference. There was no evidence of
HDD activity, no network interfaces were activated, no logs were generated.

Only after trying the workarounds did I noticed that the grub boot menu
screen was displaying the suspicious-looking version 2.02~beta3-5+deb9u1.

The only file in /boot/efi/EFI/debian was (I think) grubx64.efi.

I manually ran grub-install and it seems to have fixed everything.  I
have no idea why it was not run automatically at some stage during the
upgrade.

The system now boots via the file shimx64.efi.