Apparently grub-install does not like loopdevices, so the only solution seems
to be to regenerate the device.map manually.
The folling block should go in grub-installer ~ line 570
if db_get grub-installer/bootdev_directory && [ "$RET" ]; then
bootdev=
if ! [ -f "$device_map" ]; then
echo quit | grub --batch --device-map="$device_map"
fi
fi
--
Device.map is missing in loopinstallations (bindmounted boot)
https://bugs.launchpad.net/bugs/188460
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