This seems to be a duplicate of bug 1845454.

Could you please try the test kernel build in bug 1845454 comment 11 and
tell if that resolves the problem?

Thanks!

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https://bugs.launchpad.net/bugs/1847042

Title:
  Kernel 5.3.0-13-generic crashes at boot in tpm_read_log_efi(), HP
  EliteBook 840 G5

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Upgraded to Ubuntu 19.10 from 19.04.

  On first boot of 19.10, Kernel 5.3.0.13-generic crashed with an error
  in tpm_read_log_efi(), see screenshot. Disabling TPM in BIOS allowed
  successful boot of kernel 5.3.0.13-generic.

  Kernel 5.0.0-31-generic will boot 19.10 successfully, with or without
  TPM enabled in the BIOS.

  Hardware is HP EliteBook 840 G5. BIOS not most recent, cannot upgrade
  without installing Windows.

  ---

  $ lsb_release -rd

  Description:  Ubuntu Eoan Ermine (development branch)
  Release:      19.10

  $ apt-cache policy linux-generic

  linux-generic:
    Installed: 5.3.0.13.14
    Candidate: 5.3.0.13.14
    Version table:
   *** 5.3.0.13.14 500
          500 http://gb.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
          100 /var/lib/dpkg/status

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