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 ROSMASTERURI 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?