Public bug reported:
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)
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug eoan
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https://bugs.launchpad.net/bugs/1848892
Title:
"error: Unknown TPM error." after upgrading to grub 2.04
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