Loopback booting from an ISO image isn't really an intended use-case. The hybrid ISOs can be directly written to raw a USB block device and booted that way.
We are aware of Debian support for f2fs and intentionally decided to remove it in Ubuntu. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2060168 Title: Prebuilt signed grub images should include f2fs and exfat modules To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2-unsigned/+bug/2060168/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs