Bug#982591: grub-pc can't be updated non-interactively on debian/buster64

[Emmanuel Kasper <manu@debian.org>]

Le 12/02/2021 à 12:36, Evgeni Golov a écrit :
> On Fri, Feb 12, 2021 at 10:03:08AM +0100, Thomas Lange wrote:
>> This behaviour was also reported as #982182
> 
> Interesting, thanks!
> 
> To me the GRUB change seems reasonable, even if a tad unexpected in a
> point release.
> 
> You change to FAI [1] looks pretty much how I would envision a correct
> fix in the Vagrant box too, just executed at a different time.
> 
> Thanks!
> 
> [1] https://github.com/faiproject/fai-config/commit/bf90f3048f552f2dc1a0f50766646dff9f67aef9
> 

Thanks Thomas for the pointer to #982182.
The bug on the Vagrant box is similar but the root cause is different.
On the latest buster box:

vagrant ssh -- sudo debconf-show grub-pc | grep grub-pc/install_devices:
* grub-pc/install_devices: /dev/vda

This is because the box is built with packer which uses virtio-blk from
qemy by default and create such devices.

So for the vagrant side of this, at least for buster we should switch
the default disk driver to virtio-scsi, which creates during the install
a /dev/sda debconf entry, which is the same device name grub sees on
VirtualBox and its sata controller.