Test Drive won't start with AttributeError

When launching testdrive in Precise it crashes right away with the following error:

kermit@Glamdring:~$ testdrive
INFO: version passed: False
INFO: config passed: None
INFO: Trying config in /etc/testdriverc
INFO: Using configuration in /etc/testdriverc
INFO: Trying config in /home/kermit/.testdriverc
INFO: Trying config in /home/kermit/.config/testdrive/testdriverc
INFO: Using KVM for virtual machine hosting...
Traceback (most recent call last):
  File "/usr/bin/testdrive", line 445, in <module>
    main()
  File "/usr/bin/testdrive", line 309, in main
    td.set_defaults()
  File "/usr/lib/python2.7/dist-packages/testdrive/testdrive.py", line 203, in set_defaults
    self.SMP = commands.getoutput("grep -c ^processor /proc/cpuinfo")
AttributeError: 'module' object has no attribute 'getoutput'

The gtk version won't start either:

kermit@Glamdring:~$ testdrive-gtk
Traceback (most recent call last):
  File "/usr/bin/testdrive-gtk", line 71, in <module>
    from testdrivegtk import (
  File "/usr/lib/python2.7/dist-packages/testdrivegtk/AboutTestdrivegtkDialog.py", line 30, in <module>
    version = commands.getstatusoutput("dpkg -l testdrive-gtk | tail -n1 | awk '{print $3}'")
AttributeError: 'module' object has no attribute 'getstatusoutput'

I tried updating to the latest version in the PPA, but that didn't do anything. apt-cache show testdrive says it is Version: 3.15-0ubuntu1.