Segmentation fault (core dumped) when running turtlesim node

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Hi, I'm new to ROS and when I am trying to follow the tutorials for beginners about the 'rqt_console' Link to tutorial: link text I found an issue when trying to run turtlesim node by type 'rosrun turtlesim turtlesim_node' in the terminal. The node cannot run and it appears "Segmentation fault (core dumped)" in the terminal which I typed in 'rosrun...'

And before this, I just finished learning the last tutorial about rosservice and rosparam, by exactly following the tutorials, where the turtlesim node works just fine. Link to tutorial: link text When I finished this tutorial, I terminated the process by entering Ctrl+C in the terminals, and open a new terminal for the next tutorial.

Then I ran 'roswtf' and three error appeared as :

1. ERROR Could not contact the following nodes:* /turtlesim

   2.ERROR The following nodes should be connected but aren't:* /turtlesim->/rosout (/rosout)

   3.ERROR Errors connecting to the following services:

2. service [/turtle1/teleport_absolute] appears to be malfunctioning: Unable to communicate with service [/turtle1/teleport_absolute]
3. service [/turtlesim/get_loggers] appears to be malfunctioning: Unable to communicate with service [/turtlesim/get_loggers]
4. service [/turtlesim/set_logger_level] appears to be malfunctioning: Unable to communicate with service [/turtlesim/set_logger_level]
5. service [/reset] appears to be malfunctioning: Unable to communicate with service [/reset]
6. service [/spawn] appears to be malfunctioning: Unable to communicate with service [/spawn]
7. service [/clear] appears to be malfunctioning: Unable to communicate with service [/clear]
8. service [/turtle1/set_pen] appears to be malfunctioning: Unable to communicate with service [/turtle1/set_pen]
9. service [/turtle1/teleport_relative] appears to be malfunctioning: Unable to communicate with service [/turtle1/teleport_relative]
10. service [/kill] appears to be malfunctioning: Unable to communicate with service [/kill]

Information of my setup: OS: Linux, Ubuntu 16.04 ; ROS: kinetic

Does anyone have any idea of this issue? Thanks!