When zeroing debconf value, I was able to see that grub-installer
populates it again (grub-installer/bootdev with the wrong value
"/dev/mapper"). The code that db_sets it again is:
elif [ "$(device_to_disk "$cdsrc")" = "$default_bootdev" ] || \
([ -n "$hdsrc" ] && [ "$(device_to_disk "$hdsrc")" = "$default_bootdev"
]) || \
([ "$default_bootdev" = '(hd0)' ] && \
(([ -n "$cdfs" ] && [ "$cdfs" != "iso9660" ]) || \
[ "$hybrid" = true ])) || \
([ "$default_bootdev" != '(hd0)' ] && \
! partmap "$default_bootdev" >/dev/null && \
! grub_probe -t fs -d "$default_bootdev" >/dev/null); then
db_fget grub-installer/bootdev seen
if [ "$RET" != true ]; then
bootfs=$(findfs /boot)
[ "$bootfs" ] || bootfs="$(findfs /)"
disk=$(device_to_disk "$bootfs")
db_set grub-installer/bootdev "$disk" ---------- HERE
state=2
fi
fi
;;
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https://bugs.launchpad.net/bugs/1838525
Title:
LVM setup fails to install grub on virtio storage
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