Image with ext4 filesystems instead of grub?

I'm trying to set up a potato board for automated testing, and I'd like to use features in grub that require grub be able to write to /boot/grub/grubenv.  The image I'm using (Ubuntu 18.04 with UEFI) uses a btrfs filesystem, which grub currently doesn't know how to write to.  Are there any images using ext4 as the rootfs (or as a separate partition for /boot)?  Thanks.


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