Catkin make error

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Hi, I have ROS indigo installed on Ubuntu 14.04 on Beaglebone Black. Everything was working ok, but I made some file permission changes (I know, or actually I don't know, but that's another question). Now I get an error when I run catkin_make. It is some kind of permission error, but it doesn't say what the object is or what permission is required. The output is below. I checked the build log and error log, but there was nothing useful that I could see. I can upload them if needed. Thanks for any possible solution.

Bob

ubuntu@arm:~/catkin_ws$ catkin_make

Base path: /home/ubuntu/catkin_ws
Source space: /home/ubuntu/catkin_ws/src
Build space: /home/ubuntu/catkin_ws/build
Devel space: /home/ubuntu/catkin_ws/devel
Install space: /home/ubuntu/catkin_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/ubuntu/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/ubuntu/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/indigo
-- This workspace overlays: /opt/ros/indigo
-- Using PYTHON_EXECUTABLE: /usr/bin/python
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/ubuntu/catkin_ws/build/test_results
-- Found gtest sources under '/usr/src/gtest': gtests will be built
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.6.14
Traceback (most recent call last):
  File "/home/ubuntu/catkin_ws/build/catkin_generated/generate_cached_setup.py", line 22, in <module>
    code = generate_environment_script('/home/ubuntu/catkin_ws/devel/env.sh')
  File "/opt/ros/indigo/lib/python2.7/dist-packages/catkin/environment_cache.py", line 61, in generate_environment_script
    output = subprocess.check_output([env_script, sys.executable, '-c', python_code])
  File "/usr/lib/python2.7/subprocess.py", line 566, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child
    raise child_exception
***OSError: [Errno 13] Permission denied***
CMake Error at /opt/ros/indigo/share/catkin/cmake/safe_execute_process.cmake:11 (message):
  execute_process(/usr/bin/python
  "/home/ubuntu/catkin_ws/build/catkin_generated/generate_cached_setup.py")
  returned error code 1
Call Stack (most recent call first):
  /opt/ros/indigo/share/catkin/cmake/all.cmake:186 (safe_execute_process)
  /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:20 (include)
  CMakeLists.txt:52 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/ubuntu/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ubuntu/catkin_ws/build/CMakeFiles/CMakeError.log".
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed
ubuntu@arm:~/catkin_ws$ cat /opt/ros/indigo/share/catkin/cmake/safe_execute_process.cmake
macro(safe_execute_process cmd_keyword arg1)
  set(_cmd ${arg1})
  foreach(_arg ${ARGN})
    set(_cmd "${_cmd} \"${_arg}\"")
  endforeach()

  debug_message(2 "execute_process(${_cmd})")
  execute_process(${ARGV} RESULT_VARIABLE _res)

  if(NOT _res EQUAL 0)
    message(FATAL_ERROR "execute_process(${_cmd}) returned error code ${_res}")
  endif()
endmacro()

ubuntu@arm:~/catkin_ws$

=============================================================================

Thanks for the reply.

I ran the following 3 commands to try to sort things out, but it didn't help:

sudo find /usr/lib/python2.7 -exec chmod 777 {} \;

sudo find /home/ubuntu -exec chmod go+rw {} \;

sudo find /opt/ros/indigo/lib -exec chmod 777 {} \;

It looks like the error is happening in ... (more)