@Adam Conrad (adconrad) : thanks for the updated packages. Seems to be
solved now on my laptop. My laptop can now successfully enable TPM and
Secure boot at the same time during boot

HP-EliteBook-820-G4 ~> dmesg|egrep 'ecure|tpm|TPM'
[    0.000000] efi:  ACPI=0xd9ffe000  ACPI 2.0=0xd9ffe014  
TPMFinalLog=0xd9f76000  SMBIOS=0xd9765000  SMBIOS 3.0=0xd9763000  
MEMATTR=0xd63c0018  ESRT=0xd9766b18  TPMEventLog=0xc50a8018 
[    0.000000] secureboot: Secure boot enabled
[    0.000000] Kernel is locked down from EFI secure boot; see man 
kernel_lockdown.7
[    0.016255] ACPI: TPM2 0x00000000D9FEB000 000034 (v03 HPQOEM EDK2     
00000002      01000013)
[    4.068308] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1B, rev-id 16)
[    4.158924] integrity: Loaded X.509 cert 'Hewlett-Packard Company: HP UEFI 
Secure Boot 2013 DB key:<restricted>

HP-EliteBook-820-G4:~$ apt-cache policy grub2-common grub2
grub2-common:
  Installed: 2.04-1ubuntu12.1
  Candidate: 2.04-1ubuntu12.1
  Version table:
 *** 2.04-1ubuntu12.1 100
        100 /var/lib/dpkg/status
     2.04-1ubuntu12 500
        500 http://de.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
grub2:
  Installed: 2.04-1ubuntu12.1
  Candidate: 2.04-1ubuntu12.1
  Version table:
 *** 2.04-1ubuntu12.1 100
        100 /var/lib/dpkg/status
     2.04-1ubuntu12 500
        500 http://de.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages

$ uname -a
HP-EliteBook-820-G4 5.3.0-21-generic #22-Ubuntu SMP Tue Oct 29 22:55:51 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

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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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