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W: Target Packages (partner/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Packages (partner/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Packages (partner/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Translations (partner/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Translations (partner/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target DEP-11 (partner/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target DEP-11-icons (partner/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: http://extras.ubuntu.com/ubuntu/dists/trusty/Release.gpg: Signature by key C47415DFF48C09645B78609416126D3A3E5C1192 uses weak digest algorithm (SHA1)
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://dl.google.com/linux/earth/deb stable InRelease' doesn't support architecture 'i386'
W: Target Packages (partner/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Packages (partner/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Packages (partner/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Translations (partner/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Translations (partner/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target DEP-11 (partner/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target DEP-11-icons (partner/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list:67
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:55 and /etc/apt/sources.list:69

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Check /etc/apt/sources.list. – mikewhatever Jan 26 '18 at 06:03
1 Answers
First of all lets back up sources.list. This is always a good idea when doing anything that influences this file.
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
To be extra safe we'll edit a copy of sources.list in our home folder.
We copy sources.list and make sure we are in our home directory :
cp /etc/apt/sources.list ~/ ; cd ~
Awk is a powerful Unix command. I don't understand it very well, but you can always read up on it.
Then we'll use awk to remove the duplicate lines :
awk '!x[$0]++' sources.list > sources-revised.list
We'll check that everything looks alright :
more sources-revised.list
We'll copy it back :
sudo cp sources-revised.list /etc/apt/sources.list
We'll update :
sudo apt-get update
Thanks to Jadu Saikia for the awk knowledge

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did the awk command remove the duplicates? what did you see at the step
more sources-revised.list
? – TelamonAegisthus Nov 20 '21 at 04:17 -
There are no duplicates in my sources.list file, but I'm still seeing the "configured multiple times" messages. – Steve Lautenschlager Nov 21 '21 at 18:40
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What version of Ubuntu and apt are you running? If both versions are supported you may want to 'Report a bug' --> https://bugs.launchpad.net/ubuntu/+source/apt – TelamonAegisthus Nov 30 '21 at 00:46