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I'm trying to install one software but showing this error.

enter image description here

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    Have you tried editing sources.list and commenting out the duplicate entry? sudo nano /etc/apt/sources.list and place a # in front of the duplicate entry, then save. – Louis Matthijssen Apr 27 '14 at 11:16
  • Thx it worked... – Faisal Apr 27 '14 at 14:40
  • PUT it as an answer...thx – Faisal Jul 21 '14 at 9:25
5

Edit sources.list and comment out the duplicate entry.

  • Edit sources.list:

    sudo nano /etc/apt/sources.list
    
  • Place a # in front of the duplicate entry

  • Save:

    Ctrl + X, Y, Enter

  • Update:

    sudo apt-get update
    

Now try again.

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    Also watch out for entries under individual files @ /etc/apt/sources.list.d – Antony Dec 8 '15 at 14:22

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