The proposal calls for stripping out filesystem drivers and other features.

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A Canonical engineer has proposed stripping several features from GRUB's signed builds in Ubuntu 26.10 to reduce the pre-boot attack surface. The cuts would remove filesystem support for Btrfs, XFS, ZFS, and HFS+, along with LVM, most RAID modes, LUKS encryption, and image format support. Systems using any of these features would be blocked from upgrading to 26.10 and remain on 26.04 LTS. The proposal has drawn significant pushback from community members and a Ubuntu Technical Board member, who pointed out that Canonical's own default server installer uses LVM and LUKS, making the proposal incompatible with its own recommended setup. Critics are demanding per-feature public justification before any changes proceed.

Why Ubuntu 26.10 Might Drop ZFS, RAID & Encryption Support