autopkgtest [19:04:52]: ERROR: unexpected error:
Traceback (most recent call last):
  File "/home/ubuntu/autopkgtest/runner/autopkgtest", line 665, in main
    process_actions()
  File "/home/ubuntu/autopkgtest/runner/autopkgtest", line 629, in process_actions
    run_tests(tests, tests_tree)
  File "/home/ubuntu/autopkgtest/runner/autopkgtest", line 163, in run_tests
    opts.build_parallel)
  File "/home/ubuntu/autopkgtest/lib/adt_testbed.py", line 1111, in run_test
    test.passed()
  File "/home/ubuntu/autopkgtest/lib/testdesc.py", line 126, in passed
    adtlog.report(self.name, 'PASS')
  File "/home/ubuntu/autopkgtest/lib/adtlog.py", line 103, in report
    preport('%-20s %s' % (tname, result))
  File "/home/ubuntu/autopkgtest/lib/adtlog.py", line 99, in preport
    psummary(m)
  File "/home/ubuntu/autopkgtest/lib/adtlog.py", line 91, in psummary
    summary_stream.write(m.encode('UTF-8'))
OSError: [Errno 28] No space left on device

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/autopkgtest/runner/autopkgtest", line 674, in <module>
    main()
  File "/home/ubuntu/autopkgtest/runner/autopkgtest", line 667, in main
    errorcode = print_exception(sys.exc_info(), '')
  File "/home/ubuntu/autopkgtest/runner/autopkgtest", line 214, in print_exception
    adtlog.psummary('quitting: unexpected error, see log')
  File "/home/ubuntu/autopkgtest/lib/adtlog.py", line 91, in psummary
    summary_stream.write(m.encode('UTF-8'))
OSError: [Errno 28] No space left on device