catkin_pkg.package missing

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Hi, I'm new to Ubuntu/Linux and I am trying to install ROS. I am following the instructions but run into a cmake error when I run catkin_make. Here's the output from that command. It seems that there are similar problems but I don't see the exact same error message in other posts. Any help would be appreciated and thanks in advance.

joroso2121@ubuntu:~/catkin_ws$ catkin_make
Base path: /home/joroso2121/catkin_ws
Source space: /home/joroso2121/catkin_ws/src
Build space: /home/joroso2121/catkin_ws/build
Devel space: /home/joroso2121/catkin_ws/devel
Install space: /home/joroso2121/catkin_ws/install
####
#### Running command: "cmake /home/joroso2121/catkin_ws/src -DCATKIN_DEVEL_PREFIX=/home/joroso2121/catkin_ws/devel -DCMAKE_INSTALL_PREFIX=/home/joroso2121/catkin_ws/install" in "/home/joroso2121/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/joroso2121/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/hydro
-- This workspace overlays: /opt/ros/hydro
-- Using PYTHON_EXECUTABLE: /usr/local/bin/python
-- Python version: 2.7
-- Using Debian Python package layout
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/joroso2121/catkin_ws/build/test_results
-- Found gtest sources under '/usr/src/gtest': gtests will be built
ImportError: "from catkin_pkg.package import parse_package" failed: No module named catkin_pkg.package
Make sure that you have installed "catkin_pkg", it is up to date and on the PYTHONPATH.
CMake Error at /opt/ros/hydro/share/catkin/cmake/safe_execute_process.cmake:11 (message):
  execute_process(/usr/local/bin/python
  "/opt/ros/hydro/share/catkin/cmake/parse_package_xml.py"
  "/opt/ros/hydro/share/catkin/cmake/../package.xml"
  "/home/joroso2121/catkin_ws/build/catkin/catkin_generated/version/package.cmake")
  returned error code 1
Call Stack (most recent call first):
  /opt/ros/hydro/share/catkin/cmake/catkin_package_xml.cmake:63 (safe_execute_process)
  /opt/ros/hydro/share/catkin/cmake/all.cmake:143 (_catkin_package_xml)
  /opt/ros/hydro/share/catkin/cmake/catkinConfig.cmake:20 (include)
  CMakeLists.txt:52 (find_package)
-- Configuring incomplete, errors occurred!
Invoking "cmake" failed
joroso2121@ubuntu:~/catkin_ws$