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Your second error suggest that you do have the package vision_ssd_detect installed but not the executable, did you get any error/warnings when compiling the package ?

For your first error is this a typo when typing the question or have you tried the exact command roslaunch vision_ssd_detect vision_ssd_detect ? Because the last argument should be the full launch file name with the extension :

roslaunch vision_ssd_detect vision_ssd_detect.launch

You should also try the same command as in your tutorial instead.