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.