[Bug 1848892] Re: "error: Unknown TPM error." after upgrading to grub 2.04

[viot]

Thanks you for the workaroune. If works for an Asus UX303!
Curiously, once restarted, no confirmation was required and no problem for further boots.

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https://bugs.launchpad.net/bugs/1848892

Title:
  "error: Unknown TPM error." after upgrading to grub 2.04

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to eoan today (via `do-release-upgrade -d`), my laptop
  failed to boot into the OS. I got the grub 2.04 screen (showing only
  Ubuntu), but selecting that gave me about 20 lines of "error: Unknown
  TPM error.", followed by "error: you need to load the kernel first"
  and no way to proceed/recover. Advanced options didn't work either.
  Dropping into the grub console and writing a simple command like `set
  root=(hd1,gpt5)` failed again with a TPM error. It goes without saying
  that booting had worked before with disco/grub 2.02.

  As a workaround, I eventually managed to boot using an eoan live CD,
  chroot'ed into my system, added the `disco main` repo, and forcefully
  downgraded to disco's 2.02. After reinstalling grub to the efi
  partition, booting finally worked again (with grub 2.02).

  lsb_release -rd
  Description:	Ubuntu 19.10
  Release:	19.10

  apt-cache policy grub-efi
  grub-efi:
    Installed: 2.02+dfsg1-12ubuntu2
    Candidate: 2.04-1ubuntu12
    Version table:
       2.04-1ubuntu12 500
          500 http://ubuntu.inode.at/ubuntu eoan/main amd64 Packages
   *** 2.02+dfsg1-12ubuntu2 500
          500 http://ubuntu.inode.at/ubuntu disco/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: grub-efi 2.02+dfsg1-12ubuntu2
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Oct 19 23:20:07 2019
  InstallationDate: Installed on 2017-03-05 (958 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to eoan on 2019-10-19 (0 days ago)

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