[Bug 2043101] Re: Mantic+noble inadvertently includes the luks2 module in signed grub-efis

[Mate Kukri]

The supported setup in Ubuntu is to have a non-encrypted /boot partition
with / encrypted with LUKS2. This combined with Secure Boot should not
be a security downgrade at all.

We do not support GRUB unlocked FDE or encrypted /boot at this point,
and LUKS1 support is left in GRUB as an accident of history.

For supported partitioning schemes, please look at what the Ubuntu
installer does.

Mate Kukri

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https://bugs.launchpad.net/bugs/2043101

Title:
  Mantic+noble inadvertently includes the luks2 module in signed grub-
  efis

Status in grub2-unsigned package in Ubuntu:
  Fix Released
Status in grub2-unsigned source package in Mantic:
  Fix Released
Status in grub2-unsigned source package in Noble:
  Fix Released

Bug description:
  [ Impact ]

   * The luks2 module was accidentally enabled during a merge from Debian. This
     isn't intended to be a supported feature, and we should disable it before
     users accidentally start relying on it.

   * Removing it early in the mantic cycle reduces the chance someone relies on
     it, and hence gets broken when upgrading to noble where it is already gone.

  [ Test Plan ]

   * Boot GRUB2 in Secure Boot mode and make sure LUKS2 is unavailable.
     (e.g. insmod luks2 should throw an error)

  [ Where problems could occur ]

   * If someone already managed to create a Mantic install with /boot on a LUKS2
     encrypted location, this update will break booting with Secure Boot on.

   * However this was never a supported configuration from any
  installer, and this required deliberate manual effort to achieve.

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