pyshark isn't required on the client, it's for the server. (i.e., autotest server, which should be running in the chroot.) And I believe the SDK should be pulling in pyshark...

What exactly report did you get the pyshark error from though? The first sample I picked up was this:

https://stainless.corp.google.com/search?exclude_retried=true&first_date=2018-01-11&master_builder_name=&builder_name_number=&shard=&exclude_acts=true&builder_name=&master_builder_name_number=&owner=&retry=&exclude_cts=true&exclude_non_production=false&hostname=&board=hana%7Clars&test=%5Enetwork_WiFi_ChannelScanDwellTime%24&exclude_not_run=false&build=%5ER66%5C-10440%5C.0%5C.0%24&status=FAIL&status=ERROR&status=ABORT&reason=&waterfall=&suite=wifi_matfunc&last_date=2018-02-27&exclude_non_release=true&exclude_au=true&model=%5Ehana%24&view=list

https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/179532083-chromeos-test


and I see a different failure:

02/26 17:43:57.469 WARNI|              test:0637| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 631, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 831, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 495, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 362, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 400, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/network_WiFi_ChannelScanDwellTime/network_WiFi_ChannelScanDwellTime.py", line 182, in run_once
    dwell_time = self._channel_dwell_time_test(True)
  File "/usr/local/autotest/server/site_tests/network_WiFi_ChannelScanDwellTime/network_WiFi_ChannelScanDwellTime.py", line 169, in _channel_dwell_time_test
    return self._get_dwell_time(result_list, result_beacon_frames)
  File "/usr/local/autotest/server/site_tests/network_WiFi_ChannelScanDwellTime/network_WiFi_ChannelScanDwellTime.py", line 94, in _get_dwell_time
    sent_beacon_frames, ssid_index[0])
  File "/usr/local/autotest/server/site_tests/network_WiFi_ChannelScanDwellTime/network_WiFi_ChannelScanDwellTime.py", line 67, in _get_beacon_timestamp
    raise error.TestFail('Failed to find SSID %d in pcap.' % ssid_num)
TestFail: Failed to find SSID 203 in pcap.

I saw this on couple of the runs, I triggered. One of the job links below.
https://ubercautotest.corp.google.com/afe/#tab_id=view_job&object_id=179868942

The failure mentioned in comment#1 is occuring often. 

For the problem in your run from #2...I'm not sure what's up. Might follow up with infra folks, who can see what's up with chromeos-server-tester1.mtv.corp.google.com, which apparently didn't have the full SDK?

For the (now) $subject failures...I'm not quite sure yet. It's possible the captures are just incomplete. We'd have to look into the failures more closely. Maybe even re-run known patterns and see how much actually gets captured.

Issue is also seen on kevin.