** Description changed:
+ [Impact]
+ Some specific system (listed in upstream thread at
https://lists.gnu.org/archive/html/grub-devel/2019-10/msg00104.html)
+
+ Mostly ASUS systems, but also reported on some Dell systems.
+
+ The affected systems are used to boot in UEFI mode and will fail to
+ write measurements to the possible onboard TPM, causing failure to boot.
+
+
+ [Test case]
+ 1) Boot affected system to Ubuntu
+ 2) Verify that the system boots successfully to Ubuntu, without "unknown TPM
error" messages.
+
+ [Regression potential]
+ Low risk of regression, as this changes the current behavior only to avoid
failing to boot when such errors are encountered, instead switching the
behavior to writing debug messages (if debugging is enabled only) in such
cases. Further work may be needed later to correct or mitigate these errors if
TPM measurements are needed to work on the affected systems, as such
measurements would otherwise be incomplete.
+
+ ---
+
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
+ 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)
** Changed in: grub2 (Ubuntu Eoan)
Status: New => Triaged
** Changed in: grub2 (Ubuntu Eoan)
Importance: Undecided => High
** Changed in: grub2 (Ubuntu Focal)
Status: Confirmed => In Progress
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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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