This isn't newsworthy. I'd suggest trying at stackoverflow, but your question isn't particularly well formed to start with. Which stage of the tutorial are you

This isn't newsworthy. I'd suggest trying at stackoverflow, but your question isn't particularly well formed to start with. Which stage of the tutorial are you at? Quickly googling the error message gives https://ubuntuforums.org/showthread.php?t=1654068 https://ubuntuforums.org/showthread.php?t=1654068 which suggests it might be caused by conflicting / missing apt repositories. Good luck.