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mkdir -p catkin_ws/src
cd ~/catkin_ws/src
catkin_init_workspace
source /opt/ros/hydro/setup.bash

If this is a copy/paste (rather than a 'this is almost what I did, from memory'), shouldn't it really be:

mkdir -p catkin_ws/src
cd ~/catkin_ws/src
source /opt/ros/hydro/setup.bash
catkin_init_workspace

(note: first source, then invoke catkin_init_workspace)

At least, the Creating a workspace for catkin tutorial seems to suggest that.

mkdir -p catkin_ws/src
cd ~/catkin_ws/src
catkin_init_workspace
source /opt/ros/hydro/setup.bash

If this is a copy/paste (rather than a 'this is almost what I did, from memory'), shouldn't it really be:

mkdir -p catkin_ws/src
cd ~/catkin_ws/src
source /opt/ros/hydro/setup.bash
catkin_init_workspace

(note: first source, then invoke catkin_init_workspace)

At least, the Creating a workspace for catkin tutorial seems to suggest that.that (first commandline under Prerequisites).