apt-get update && sudo apt-get dist-upgrade with warnings

[Pfiff]

What can I do about this messages

Code:

sudo apt-get update && sudo apt-get dist-upgrade

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Paketlisten werden gelesen... Fertig
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target DEP-11-icons-hidpi (main/dep11/icons-128x128.tar) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://ds9-maui.s3-website.eu-central-1.amazonaws.com/maui-xenial-backports-neon xenial InRelease' doesn't support architecture 'i386'
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target DEP-11-icons-hidpi (main/dep11/icons-128x128.tar) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5

???

Ciao!

Dieter