Ubuntu 26.10 ships with a ‘slimmed down GRUB

Canonical has made a major change to the way Ubuntu boots on devices with Secure Boot enabled to reduce the attack surface of the boot process. Ubuntu 26.10 uses a signed build of GRUB that 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. It still supports /boot on ext4, FAT and ISO9660 (uses for booting CD/DVDs), as well as, naturally, squashfs for snaps. The change only affects systems with Secure Boot enabled. If Secure Boot is disabled, […]
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https://www.omgubuntu.co.uk/2026/10/ubuntu-2610-secure-boot-grub-change