"Unhandled LoginException: Timed out going through login screen. Cryptohome not mounted. OOBE not dismissed."

e.g. https://wmatrix.googleplex.com/testrun/unfiltered?test_ids=467925201

04/16 13:31:47.524 INFO |              oobe:0039| Invoking Oobe.loginForTesting
04/16 13:46:56.982 ERROR|           browser:0065| Failure while starting browser backend.
Traceback (most recent call last):
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 58, in __init__
    self._browser_backend.Start()
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 169, in Start
    + self._GetLoginStatus())
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 277, in _RaiseOnLoginFailure
    raise exceptions.LoginException(error)
LoginException: Timed out going through login screen. Cryptohome not mounted. OOBE not dismissed.
04/16 13:46:56.987 ERROR|            chrome:0169| Timed out logging in, tries=2, error=LoginException('Timed out going through login screen. Cryptohome not mounted. OOBE not dismissed.',)
04/16 13:46:57.003 WARNI|              test:0615| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 609, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 823, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled LoginException: Timed out going through login screen. Cryptohome not mounted. OOBE not dismissed.
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 817, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 470, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 380, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/cros/enterprise/enterprise_policy_base.py", line 475, in run_once
    self.run_test_case(self.case)
  File "/usr/local/autotest/tests/policy_DisableScreenshots/policy_DisableScreenshots.py", line 136, in run_test_case
    self.setup_case(self.POLICY_NAME, case_value, self.SUPPORTING_POLICIES)
  File "/usr/local/autotest/cros/enterprise/enterprise_policy_base.py", line 198, in setup_case
    self._launch_chrome_browser()
  File "/usr/local/autotest/cros/enterprise/enterprise_policy_base.py", line 403, in _launch_chrome_browser
    autotest_ext=True)
  File "/usr/local/autotest/common_lib/cros/chrome.py", line 158, in __init__
    self._browser = browser_to_create.Create(finder_options)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_finder.py", line 50, in Create
    self._credentials_path)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_with_oobe.py", line 14, in __init__
    backend, platform_backend, credentials_path)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 58, in __init__
    self._browser_backend.Start()
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 169, in Start
    + self._GetLoginStatus())
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 277, in _RaiseOnLoginFailure
    raise exceptions.LoginException(error)
LoginException: Timed out going through login screen. Cryptohome not mounted. OOBE not dismissed.