Note, Bionic and Focal will likely require more than just that patch.
There were multiple patches for Python 3 support landed in apparmor 3. I
am not sure what the exact combination required will be.

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https://bugs.launchpad.net/bugs/2000062

Title:
  test-pivot_root_parse.py in apparmor failed with ImportError: No
  module named apparmor.aa

Status in ubuntu-kernel-tests:
  New
Status in apparmor package in Ubuntu:
  New
Status in apparmor source package in Bionic:
  New
Status in apparmor source package in Focal:
  New

Bug description:
  Steps to reproduce:
  # Via qa-regression-testing
  git clone --depth=1 git://git.launchpad.net/qa-regression-testing
  cd qa-regression-testing/scripts
  sudo python3 ./test-apparmor.py -v ApparmorTestsuites.test_utils_testsuite

  # Or with apparmor directly
  git clone -b ubuntu/focal-devel 
https://git.launchpad.net/ubuntu/+source/apparmor 
  cd apparmor/utils
  export USE_SYSTEM=1
  make check

  Output:
  LANG=C podchecker -warning -warning *.pod
  aa-audit.pod pod syntax OK.
  aa-autodep.pod pod syntax OK.
  aa-cleanprof.pod pod syntax OK.
  aa-complain.pod pod syntax OK.
  aa-decode.pod pod syntax OK.
  aa-disable.pod pod syntax OK.
  aa-easyprof.pod pod syntax OK.
  aa-enforce.pod pod syntax OK.
  aa-genprof.pod pod syntax OK.
  aa-logprof.pod pod syntax OK.
  aa-mergeprof.pod pod syntax OK.
  aa-notify.pod pod syntax OK.
  aa-remove-unknown.pod pod syntax OK.
  aa-sandbox.pod pod syntax OK.
  aa-status.pod pod syntax OK.
  aa-unconfined.pod pod syntax OK.
  logprof.conf.pod pod syntax OK.
  aa-notify syntax OK
  Checking aa-easyprof
  Checking aa-genprof
  Checking aa-logprof
  Checking aa-cleanprof
  Checking aa-mergeprof
  Checking aa-autodep
  Checking aa-audit
  Checking aa-complain
  Checking aa-enforce
  Checking aa-disable
  Checking aa-status
  Checking aa-unconfined
  Checking apparmor
  Checking test/common_test.py
  Checking test/minitools_test.py
  Checking test/test-aa-decode.py
  Checking test/test-aa-easyprof.py
  Checking test/test-aa.py
  Checking test/test-aamode.py
  Checking test/test-aare.py
  Checking test/test-baserule.py
  Checking test/test-capability.py
  Checking test/test-change_profile.py
  Checking test/test-common.py
  Checking test/test-config.py
  Checking test/test-dbus.py
  Checking test/test-example.py
  Checking test/test-file.py
  Checking test/test-libapparmor-test_multi.py
  Checking test/test-logparser.py
  Checking test/test-mount_parse.py
  Checking test/test-network.py
  Checking test/test-parser-simple-tests.py
  Checking test/test-pivot_root_parse.py
  Checking test/test-profile-list.py
  Checking test/test-profile-storage.py
  Checking test/test-ptrace.py
  Checking test/test-regex_matches.py
  Checking test/test-rlimit.py
  Checking test/test-severity.py
  Checking test/test-signal.py
  Checking test/test-translations.py
  Checking test/test-unix_parse.py
  make[1]: Entering directory 
'/home/ubuntu/testlibwl29iqzr/source/focal/apparmor-2.13.3/utils/test'

  === test-example.py ===
  .......
  ----------------------------------------------------------------------
  Ran 7 tests in 0.000s

  OK
  .......
  ----------------------------------------------------------------------
  Ran 7 tests in 0.000s

  OK

  === test-pivot_root_parse.py ===
  Traceback (most recent call last):
    File "test-pivot_root_parse.py", line 12, in <module>
      import apparmor.aa as aa
  ImportError: No module named apparmor.aa
  make[1]: *** [Makefile:81: check] Error 1
  make[1]: Leaving directory 
'/home/ubuntu/testlibwl29iqzr/source/focal/apparmor-2.13.3/utils/test'
  make: *** [Makefile:97: check] Error 2

  
  Issue found on B-ibm-gt-5.4, F-oem-5.14, F-aws-fips after we changed how we 
run the ubuntu_qrt_apparmor test in bug 1982439.

  Sub-test in ApparmorTestsuites.test_utils_testsuite will fail with
  this.

  After some inspection it is because the script is trying to use python2. This 
can be verified with:
  python2 -c "import apparmor.aa"
  python3 -c "import apparmor.aa"

  This appears to be a known issue.
  
https://gitlab.com/apparmor/apparmor/-/commit/af69088546d7d2f7188b9dec814f81721254964f

  And this patch has already landed in apparmor on Jammy, we will need this for 
Bionic / Focal as well. A temporary workaround is to run:
  export PYTHON_VERSIONS=python3

  Before starting the tests.

  I am not sure why this was not uncovered with "./test-apparmor.py -v"
  in q-r-t until we run test cases one-by-one now.

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