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I also went through the same problem. I launched the

roscore &

command in the background in a terminal. Later I exit through that terminal without killing it. Now the roscore is running in the background but we have already exit its corresponding terminal. So when in new terminal when I type

jobs

to search for tasks running in the background, then nothing appears, so it seems like roscore is not running. While if you type

roscore

command again, it will show the same message as yours. Try the commands as mentioned in previous answers:- killall -9 roscore

I also went through the same problem. I launched the

command in the background in a terminal. Later I exit through that terminal without killing it. Now the roscore is running in the background but we have already exit its corresponding terminal. So when in new terminal when I type

jobs

to search for tasks running in the background, then nothing appears, so it seems like roscore is not running. While if you type

roscore

command again, it will show the same message as yours. Try the commands as mentioned in previous answers:-

killall -9 roscoreroscore