Ubuntu 26.10 drops Btrfs, XFS & ZFS /boot support under Secure Boot

Canonical has confirmed a change in how Ubuntu 26.10 boots on devices with Secure Boot enabled, in an effort to reduce the the attack surface of the boot process. Ubuntu 26.10’s signed build of GRUB, which is only used on systems with Secure Boot turned on, no longer supports /boot on Btrfs, XFS, ZFS, LVM, LUKS encryption or software RAID (other than RAID1). HFS+, Apple partition table support and JPEG and PNG image loading is also removed. Ubuntu 26.10 still supports /boot on ext4, FAT and ISO9660 (used for booting from CD/DVDs), as well as, naturally, squashfs for snaps when […] You're reading Ubuntu 26.10 drops Btrfs, XFS & ZFS /boot support under Secure Boot, a blog post from OMG! Ubuntu. Do not reproduce elsewhere without permission.

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