Comment 1 for bug 1423497

This is how it looks like for me with 3.9.6:

$ adt-run -B ~/ubuntu/tmp/testpkg// --- ssh -s adb
adt-run [12:29:47]: git checkout: c97d402 Include "Package-Type: deb" marked packages for testing
Waiting for device ADB to appear...
Configuring Ubuntu phone for testing...
Preparing Ubuntu phone for running tests...
Waiting for desktop to boot
ERROR: timed out waiting for Unity greeter
<VirtSubproc>: failure: setup script failed with code 1: ssh-setup/adb open
adt-run [12:29:48]: ERROR: testbed failed: cannot send to testbed: ['BrokenPipeError: [Errno 32] Broken pipe\n']

which is quite reasonable. Which autopkgtest version do you have?