[Bug 2084107] Re: Splash does not show up on Ubuntu 24.10 with TPM FDE

[Alexander Koskovich]

update-grub doesn't exist on TPM FDE installs, changing
/etc/default/grub doesn't have any effect

If I escape to the grub menu early on I only have a single "run" option
and when I hit c to edit it I have no kernel options to modify. It just
specifies the rootfs.

Looking at https://ubuntu.com/core/docs/full-disk-encryption:
"TPM-based FDE seals the FDE secret key to the full EFI state, including the kernel command line, which is subsequently unsealed by the initrd code in the secure-boot protected kernel.efi at boot time."

Which explains why my system fails to boot when I modify it. Not sure
how to debug this.

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https://bugs.launchpad.net/bugs/2084107

Title:
  Splash does not show up on Ubuntu 24.10 with TPM FDE

Status in plymouth package in Ubuntu:
  Incomplete

Bug description:
  In addition to the splash not showing up, it also causes the system to
  hang on power down.

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