I have been getting the same error and cannot start the tpm2-service:

$ sudo systemctl start tpm2-abrmd.service
Job for tpm2-abrmd.service failed because the control process exited with error code. See "systemctl status tpm2-abrmd.service" and "journalctl -xe" for details.

$ systemctl status tpm2-abrmd.service
tpm2-abrmd.service: Main process exited, code=exited, status=1/FA
Failed to start TPM2 Access Broker and Resource Management Daemon
Unit entered failed state.
Failed with result 'exit-code'.

# Start manually:
$ /usr/local/sbin/tpm2-abrmd&
** (tpm2-abrmd:1596): WARNING **: failed to initialize device TCTI context: 0xa000a
** (tpm2-abrmd:1596): CRITICAL **: TCTI Initializaiton: 0xa000a

$ tpm2_rc_decode 0xa000a
tcti:IO failure

So it seems that this is a known bug:
https://github.com/tpm2-software/tpm2-abrmd/issues/321
https://github.com/tpm2-software/tpm2-abrmd/pull/330

Is there a workaround?  The discussion is too cryptic for me. For example,  I can't find a tpm2_listpcrs command in  tpm2-tools (or -abrmd or -tss). I am running on Ubuntu Linux with a simulator.

Dan

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Today's Topics:

   1. Re: TCTI initialization fails with error 0xc000b
      (Roberts, William C)