Project Wild Penguin 17.4.2017: Fix duplicate sources.list entry

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To fix the above mentioned error, follow the list of steps that most easily provides the solution (also to backup PPA repository and other features too):

You can remove duplicate entries in few easy steps with Y PPA Manager
 sudo add-apt-repository ppa:webupd8team/y-ppa-manager -y
 sudo apt-get update
 sudo apt-get install y-ppa-manager -y
Open y-ppa-manager form Dash

Enter You Admin Password.

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Double Click On Advanced.

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Scan & Remove Duplicate PPA's & Click Ok.

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It will take some time ( 1 or 2 Mints ) To Scan & Remove Duplicate PPA's.

Source: https://askubuntu.com/questions/120621/how-to-fix-duplicate-sources-list-entry

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