roscore command not found

edit

I was able to solve a similar problem by sourcing the main ros setup.bash file

source /opt/ros/jade/setup.bash

and then recompiling in my catkin workspace.

~/catkin_sw$ catkin_make

It seems that my workspace setup.bash was corrupted somehow.

command not found can mean that the binary in question could not be found, but it can also indicate that the interpreter for that binary was missing.

which roscore should tell you if the roscore binary can be found or not. If it isn't found for some reason, you should check that the ros-hydro-roslaunch package is installed. If it does exist, you should make sure that it actually exists and isn't a broken symlink or something.

roscore uses /usr/bin/python as the interpreter, so you should also check that you have a python interpreter installed.

UPDATE

On my system, roscore is located in /opt/ros/hydro/bin/roscore. If that file doesn't exist, there's something wrong with your installation, and you should reinstall roslaunch with sudo apt-get install --reinstall rod-hydro-roslaunch. If it does exist, you should make sure that /opt/ros/hydro/bin is in your PATH.

I had the same problem I typed source /opt/ros/hydro/setup.bash in terminal then my problem solved :-)

I'm not sure if the source of this problem was specified, but I think it has something to do with running catkin_make with sudo. It created a setup.bash that wouldn't run with the /opt/ros/kinetic/setup.bash, probably because the sourcing of the workspace's setup.bash doesn't have sudo rights but the devel folder does.

Basically don't use sudo.

I encountered the same problem, solved it as described here (source setup.bash, remove build/ and devel/, build using catkin_make) but it kept coming back.

I use QTCreator to edit and build my code. Turned out the error arose because I launched QTCreator from the Ubuntu launcher instead of from a terminal in which the ROS environment is set up correctly.