I'm new to ROS. I just installed ROS on Ubuntu 11.10 in a VirtualBox (running on OSX).

I started 'roscore' in one terminal and 'roslaunch turtle_tf turtle_tf_demo.launch' in another. The simulator is showed a few seconds and then it crashes. See output of both termnials below.

I've tried to install ROS on Ubuntu 12.04 in a VirtualBox and got the same error (and some more python errors in addition).

Is there a problem running ROS in a virtual environment? Any other suggestions?

```

jonas@gizur-ubuntu2:~$ roslaunch turtle_tf turtle_tf_demo.launch ... logging to /home/jonas/.ros/log/6dcb60b4-5587-11e2-8183-0800275bff20/roslaunch-gizur-ubuntu2-7447.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.

started roslaunch server xxxxx://gizur-ubuntu2:57830/

SUMMARY

PARAMETERS * /rosdistro * /rosversion * /scale_angular * /scale_linear * /turtle1_tf_broadcaster/turtle * /turtle2_tf_broadcaster/turtle

NODES / sim (turtlesim/turtlesim_node) teleop (turtlesim/turtle_teleop_key) turtle1_tf_broadcaster (turtle_tf/turtle_tf_broadcaster.py) turtle2_tf_broadcaster (turtle_tf/turtle_tf_broadcaster.py) turtle_pointer (turtle_tf/turtle_tf_listener.py)

ROS_MASTER_URI=xxxxx://localhost:11311

core service [/rosout] found process[sim-1]: started with pid [7467] process[teleop-2]: started with pid [7468] process[turtle1_tf_broadcaster-3]: started with pid [7469]

Reading from keyboard

Use arrow keys to move the turtle. process[turtle2_tf_broadcaster-4]: started with pid [7480]

(turtlesim_node:7467): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

(turtlesim_node:7467): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

(turtlesim_node:7467): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

(turtlesim_node:7467): Gtk-WARNING *: Unable to locate theme engine in module_path: "pixmap", process[turtle_pointer-5]: started with pid [7485] Traceback (most recent call last): File "/opt/ros/fuerte/stacks/geometry_tutorials/turtle_tf/nodes/turtle_tf_listener.py", line 57, in <module> (trans,rot) = listener.lookupTransform('/turtle2', '/turtle1', rospy.Time()) tf.ExtrapolationException: Lookup would require extrapolation at time 1357205137.223782063, but only time 1357205137.224574089 is in the buffer, when looking $ [turtle_pointer-5] process has died [pid 7485, exit code 1, cmd /opt/ros/fuerte/stacks/geometry_tutorials/turtle_tf/nodes/turtle_tf_listener.py __name:=turtle$ log file: /home/jonas/.ros/log/6dcb60b4-5587-11e2-8183-0800275bff20/turtle_pointer-5.log

jonas@gizur-ubuntu2:~$ roscore ... logging to /home/jonas/.ros/log/6dcb60b4-5587-11e2-8183-0800275bff20/roslaunch-gizur-ubuntu2-7405.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.

started roslaunch server xxxxx://gizur-ubuntu2:53873/ ros_comm version 1.8.10

SUMMARY

PARAMETERS * /rosdistro * /rosversion

NODES

auto-starting new master process[master]: started with pid [7421] ROS_MASTER_URI=xxxxx://gizur-ubuntu2:11311/

setting /run_id to 6dcb60b4-5587-11e2-8183-0800275bff20 process[rosout-1]: started with pid [7434] started core service [/rosout]

```