roslaunch turtlebot_bringup minimal.launch not working+anaconda+python3.6

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The system is ubuntu14.04, I install the Anaconda 3, and I create an environment which belongs to python3.6. I install ros in anaconda python3.6 environment, I add the path like this: export PATH="/home/ariel/anaconda3/bin:$PATH" source /opt/ros/indigo/setup.bash and I install turtlebot. I go into the python3.6 environment, and print like this: sudo apt-get install ros-indigo-turtlebot ros-indigo-turtlebot-apps ros-indigo-turtlebot-interactions ros-indigo-turtlebot-simulator ros-indigo-kobuki-ftdi ros-indigo-rocon-remocon ros-indigo-rocon-qt-library ros-indigo-ar-track-alvar-msgs

however, when I use this instrction:roslaunch turtlebot_bringup minimal.launch it has some error:

(python3) ariel@ariel-ThinkPad-T420:~$ roslaunch turtlebot_bringup minimal.launch 
... logging to /home/ariel/.ros/log/6787eee4-0a21-11e8-a515-8c705a64ffd4/roslaunch-ariel-ThinkPad-T420-23885.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Traceback (most recent call last):
  File "/opt/ros/indigo/share/xacro/xacro.py", line 60, in <module>
    import xacro
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xacro/__init__.py", line 36, in <module>
    import glob
ModuleNotFoundError: No module named 'glob'
while processing /opt/ros/indigo/share/turtlebot_bringup/launch/includes/robot.launch.xml:
while processing /opt/ros/indigo/share/turtlebot_bringup/launch/includes/description.launch.xml:
Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/indigo/share/xacro/xacro.py '/opt/ros/indigo/share/turtlebot_description/robots/kobuki_hexagons_asus_xtion_pro.urdf.xacro'] returned with code [1]. 

Param xml is <param command="$(arg urdf_file)" name="robot_description"/>
The traceback for the exception was written to the log file

I don't know how to do, can anyone give me some advive? Thank you!