Many thanks to Scott Sweeny who provided the attached new packages 
tpm2-new-packages.tar.gz for a trial test.

Results below, I think we can separate the issues we see now into 2 
different conclusions:

[CASE A]
With new TPM2 packages + latest test scripts in 
https://github.com/01org/tpm2.0-tools (scripts in test/system/*), we see 
the following 6 failures:
    --------------
    (a) test_tpm2_quote.sh fail
    (b) test_tpm2_unseal.sh fail
    (c) test_tpm2_encryptdecrypt.sh fail
    (d) test_tpm2_send_command.sh fail
    (e) test_tpm2_dump_capability.sh fail
    (f) test_tpm2_startup.sh fail
    --------------
Note that tests (d)~(f) are new cases that were previously not in github.
If we exclude cases (d)~(f), our outcome matches (1) the results using 
"tpm2" snap and (2) results in comment #6.

=> CONCLUSION: The packages provided by Scott confirmed working as
expected.


[CASE B]
With new TPM2 packages + plainbox-provider-tpm2 (0.31~ppa~ubuntu16.04.1):
    --------------
    Most cases still fail, see attached 
tpm2-new-packages_plainbox-report.html
    --------------
=> CONCLUSION: seems like an update is required for 
plainbox-provider-tpm2 to (a) resolve these failures and (b) include new 
cases introduced in github if needed


** Attachment added: "tpm2-new-packages_plainbox-report.html"
   
https://bugs.launchpad.net/bugs/1642118/+attachment/4806618/+files/tpm2-new-packages_plainbox-report.html

** Attachment added: "tpm2-new-packages.tar.gz"
   
https://bugs.launchpad.net/bugs/1642118/+attachment/4806619/+files/tpm2-new-packages.tar.gz

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https://bugs.launchpad.net/bugs/1642118

Title:
  Several TPM2.0 tests fail

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