[Solved] Roscore display not installed Error: Command ‘roscore’ not found, but can be installed with…

(1) Error:

Roscore operation shows that it is not installed

Press the prompt to report an error,

But it’s actually installed

(2) Solution:

vim ~/.bashrc

Delete source/opt/ROS/melody/setup.bash save and exit

Terminal recompilation

echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
source ~/.bashrc

Press roscore again to start.

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