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2012-05-07 04:51:16 -0500 commented answer Visualizing Turtlebot Kinect Data - Empty menu on New Display window

Plugins were not checked. Now that I checked it, the list is visible now.

2012-05-07 04:50:37 -0500 received badge  Scholar (source)
2012-05-07 04:45:24 -0500 commented question stop: unknown instance

Yes. I run sudo ./install.bash wlan0 command. But that didnt help. With a clean (and more stable) installation, everything seems to work.

2012-05-04 04:59:58 -0500 answered a question stop: unknown instance

I wiped clean everything.

Installed Ubuntu 10.04 LTS (Lucid) + ROS Diamondback

So far, I am not getting this error.

This is not a good solution, but it worked.

2012-05-03 09:57:21 -0500 received badge  Student (source)
2012-05-03 04:54:57 -0500 commented answer Turtlebot Upstart Install Failure

I am having a similar problem. http://answers.ros.org/question/33198/stop-unknown-instance But installing daemon tools didn't solve mine. Did you do something else to fix this?

2012-05-03 04:23:07 -0500 asked a question stop: unknown instance

Relatively new turtlebot user.
I had a clean Ubuntu 11.10 install to my turtlebot laptop (a HP Mini). I installed ROS electric following the instructions here:
http://ros.org/wiki/Robots/TurtleBot/Robot%20Install
I changed ROS_MASTER_URI and ROS_HOSTNAME on laptop and rebooted. I get the following when trying to stop turtlebot service

turtlebot@turtlebot1:/$ sudo service turtlebot stop
stop: Unknown instance:

My problem is similar to http://answers.ros.org/question/12933/turtlebot-upstart-install-failure

Also, I can start as many instances as I want without any warning:

turtlebot@turtlebot1:~$ sudo service turtlebot start
turtlebot start/running, process 1850
turtlebot@turtlebot1:~$ sudo service turtlebot start
turtlebot start/running, process 2008
turtlebot@turtlebot1:~$ sudo service turtlebot start
turtlebot start/running, process 2166

Communication with master fails:

turtlebot@Turtlebot-WS:~$ rostopic echo /diagnostics ERROR: Unable to communicate with master!

What is missing?

2012-05-03 04:22:09 -0500 asked a question stop: unknown instance

Relatively new turtlebot user.
I had a clean Ubuntu 11.10 install to my turtlebot laptop (a HP Mini). I installed ROS electric following the instructions here:
http://ros.org/wiki/Robots/TurtleBot/Robot%20Install
I changed ROS_MASTER_URI and ROS_HOSTNAME on laptop and rebooted. I get the following when trying to stop turtlebot service

turtlebot@turtlebot1:~$ sudo service turtlebot stop
stop: Unknown instance:

Next, I started turtlebot service.
I can start as many instances as I want without any warning:

turtlebot@turtlebot1:~$ sudo service turtlebot start
turtlebot start/running, process 2089
turtlebot@turtlebot1:~$ sudo service turtlebot start
turtlebot start/running, process 2247
turtlebot@turtlebot1:~$ sudo service turtlebot start
turtlebot start/running, process 2405

Although turtlebot service is started (3 times) communication with master fails:

turtlebot@Turtlebot-WS:~$ rostopic echo /diagnostics
ERROR: Unable to communicate with master!

My problem is similar to http://answers.ros.org/question/12933/turtlebot-upstart-install-failure
That one was solved by installing daemontools. It was installed at this step:
sudo apt-get install ros-electric-turtlebot-robot
during ROS installation.

What is missing?

Before you ask, ouput of ps axuf

turtlebot@turtlebot1:~$ ps auxf
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         2  0.0  0.0      0     0 ?        S    17:42   0:00 [kthreadd]
root         3  0.2  0.0      0     0 ?        S    17:42   0:02  \_ [ksoftirqd/0]
root         6  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [migration/0]
root         7  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [migration/1]
root         8  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [kworker/1:0]
root         9  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [ksoftirqd/1]
root        11  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [cpuset]
root        12  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [khelper]
root        13  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [netns]
root        15  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [sync_supers]
root        16  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [bdi-default]
root        17  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [kintegrityd]
root        18  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [kblockd]
root        19  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [ata_sff]
root        20  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [khubd]
root        21  0.0  0.0      0     0 ?        S<   17:42   0:00  \_ [md]
root        22  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [kworker/1:1]
root        23  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [khungtaskd]
root        24  0.0  0.0      0     0 ?        S    17:42   0:00  \_ [kswapd0]
root        25  0.0  0.0      0     0 ?        SN   17:42   0:00  \_ [ksmd]
root ...
(more)
2012-05-02 04:27:06 -0500 commented answer Can't access turtlebot through ttyUSB0

I had a similar problem. I followed the instructions here, and got my turtlebot working for a day. I shutdown everything at the weekend. On monday, I was back to zero. I am getting "Failed to open port /dev/ttyUSB0" What can cause this?

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2012-04-26 02:28:10 -0500 answered a question Visualizing Turtlebot Kinect Data - Empty menu on New Display window

Nope, that link doesn't help. I couldn't get there. I cannot add a Camera or PointCloud2 since nothing is listed at the New Display window.

If you can open the following image from the RViz user guide: http://mirror.umd.edu/roswiki/attachments/rviz(2f)UserGuide/new_display_dialog.png In my case, there are no options listed.

2012-04-25 23:55:45 -0500 asked a question Visualizing Turtlebot Kinect Data - Empty menu on New Display window

New turtlebot user. I was able to teleoperate turtlebot. Now I am following "Visualizing Turtlebot Kinect Data" tutorial. When I click the Add button on RViz window, New Display window opens, but there is nothing listed to add. Do I need to install anything special before running RViz?