Nav in 5 Days example 1.1 robot does not move

I am trying to do exercise 1.1 in shell #1 I ran:

roslaunch turtlebot_navigation_gazebo gmapping_demo.launch

in shell #2 I ran:

roslaunch turtlebot_teleop keyboard_teleop.launch

However the robot in the simulator does not move. When I try to manually send /cmd_vel via ‘rostopic pub’ the robot still does not move. Is there something wrong with the simulation?

I reloaded the simulation and now it seems to work. weird

Sometimes Gazebo can crash and the best way to solve it is to reload the simulation. Good that you could solve it by yourself!