IMHO, we found the reason. Because of new snap packages there were a lot
of existing loop devices when the installer created loop devices for

So the loop device for installing is /dev/loop10 which is a problem for
grub. The range of supported loop devices is from /dev/loop0 to

Either it is necessary to change the selection /dev/loop[0-9] in

/etc/grub.d/10_linux from package grub-common (maybe also other files)
/etc/grub.d/10_lupin from package lupin-support
/usr/share/lupin-support/grub-mkimage from package lupin-support

or to change the mount sequence or the loop device names for snap

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  Installer crashes at installing grub

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