Hello i have this error when launch apt-get update command on my ubuntu server : how can i solve this?

    W: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.
W: Duplicate sources.list entry http://download.opensuse.org/repositories/isv:/ownCloud:/community/xUbuntu_14.10/  Packages (/var/lib/apt/lists/download.opensuse.org_repositories_isv:_ownCloud:_community_xUbuntu%5f14.10_Packages)
W: Duplicate sources.list entry http://download.opensuse.org/repositories/isv:/ownCloud:/community/xUbuntu_14.04/  Packages (/var/lib/apt/lists/download.opensuse.org_repositories_isv:_ownCloud:_community_xUbuntu%5f14.04_Packages)

W: Duplicate sources.list entry http://....

You have a duplicate entry in your source.list

Manually :

Edit your sources.list , comment out or remove the duplicate entry.

Through GUI :

Install Y PPA Manager

sudo add-apt-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install y-ppa-manager

Then choose scan and remove duplicate PPAs from the advanced options of Y PPA Manager

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