When I try to open "packet tracer" in Kali Linux, the result is :

./PacketTracer7: error while loading shared libraries: ./libpng12.so.0: cannot read file data: Error 21
  • Welcome to the the Unix and Linux stack exchange! Please review the Help Center to get information on how to best post to the site. Take the Tour if you are not familiar with how this site works. To get to your question, What version of libpng do you have? Likely you are missing that library or have a newer version and your software is expecting it thus unable to run. Please try fixing that first and then edit your post if you run into any other issues. Thank you! – kemotep May 28 at 18:18

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