Hrm, no much output of long debugging :-/
Failing to see where/why/how the difference dconf choices are populated 
differently for sata-vs-virtio I started to compare things with disco ...

As expected it works there and grub-installer is called with /dev/vda as
argument.

Next I went into comparing the d-i components between disco and eoan but
other than the name change in bug 1782507 nothing seemed too related.
And this change came after this bug here reported (per paride since June
18, 2019)

Next I analyzed grub-probe behavior in the three environments eoan-sata, 
eoan-virtio and disco-virtio.
But this part always behaves the same reporting the volume group.

So it really seems to come down finding why d-i populated the values
differently as Rafael already assumed.

P.S. along the debugging I wondered for further work about d-i coming in
components. Is there a good way/scripts that one could use exchange
those e.g. the older/newer partman-lvm and then rebuild the ISO?

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https://bugs.launchpad.net/bugs/1838525

Title:
  LVM setup fails to install grub on virtio storage

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