Hi, see: https://bugzilla.redhat.com/show_bug.cgi?id=1226520
# atomic run cgwalters/ostree-grub2-fix Should either validate or help you fix it. The fixed ostree made it into the main updates stream, so once you've successfully updated, future updates should succeed reliably. There is some planning talk around regenerating images regularly, and once that's done, it will include the fixed version by default.
