hsupu edited a comment on issue #3345:
URL: 
https://github.com/apache/incubator-dolphinscheduler/issues/3345#issuecomment-666271162


   you got a "[[: not found", for this case, you should use `bash` instead of 
`dash` first to make the script work normally.
   
   ```sh
   # set "no" in the prompt
   sudo dpkg-reconfigure dash
   ```


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