ImportError for any rosdep command

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Any rosdep command I try to run gives me the same error:

[robosalmon ~/catkin_ws_source_pkgs (localhost)]$ rosdep -h
Traceback (most recent call last):
  File "/usr/bin/rosdep", line 3, in <module>
    from rosdep2.main import rosdep_main
  File "/usr/lib/python2.7/dist-packages/rosdep2/__init__.py", line 45, in <module>
    from .lookup import RosdepDefinition, RosdepView, RosdepLookup, \
  File "/usr/lib/python2.7/dist-packages/rosdep2/lookup.py", line 44, in <module>
    from .sources_list import SourcesListLoader
  File "/usr/lib/python2.7/dist-packages/rosdep2/sources_list.py", line 49, in <module>
    from .gbpdistro_support import get_gbprepo_as_rosdep_data, download_gbpdistro_as_rosdep_data
  File "/usr/lib/python2.7/dist-packages/rosdep2/gbpdistro_support.py", line 19, in <module>
    from .platforms.debian import APT_INSTALLER
  File "/usr/lib/python2.7/dist-packages/rosdep2/platforms/debian.py", line 34, in <module>
    from rospkg.os_detect import OS_DEBIAN, OS_LINARO, OS_UBUNTU, OsDetect
ImportError: cannot import name OS_LINARO

I've tried sudo apt-get install python-rosdep and it was apparently successful, but didn't fix rosdep.

How can I fix rosdep?