Summary:

1. Still can reproduce the issue (#31) after deleting PK and enrolling 
db/KEK/custom PK vis BIOS settings.
For details, please refer to #38 and [1].

2. Can install the uc20 test image[2][3] with TPM and secure boot enabled on 
other x86 machines (not TGL-H and EHL).
And, I only enrolled KEK and DB via BIOS settings.
For details, please refer to #36

3. When I enroll the key by mokutil, the error message is different from #31.
For details, please refer to #39.

@Chris
Any thoughts on this?
Based on above test results, it looks like #31 is a BIOS issue?

---
[1] https://bugs.launchpad.net/intel/+bug/1939505/comments/3
[2] 
https://github.com/EthanHsieh/secboot/commit/f1b9e1593b2a952be77b63f8b31cc3787b1e3e0d
[3] 
https://github.com/EthanHsieh/go-tpm2/commit/b5a8526eb2402689024c0deeba778733036a3084

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https://bugs.launchpad.net/bugs/1938678

Title:
  [intel] [tgl-h][iotg] [hwe-tpm] Ubuntu Core hangs during bootup on
  TGL-H

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