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W: Duplicate sources.list entry http://packages.matrix.one/matrix-creator/ ./ Packages (/var/lib/apt/lists/packages.matrix.one_matrix-creator_._Packages) (9 times) W: You may want to run apt-get update to correct these problems

I tried "sudo apt-get upgrade" and "sudo apt-get dist-upgrade" but it still doesn't works. I also tried to remove the duplicate sources by: "sudo awk '!a[$0]++' /etc/apt/sources.list" "grep -R --include="*.list" chrome /etc/apt/" However, it still doesn't work please help, thank you.

  • also did you try sudo apt-get update – Dr.Rabbit Oct 6 '17 at 7:59
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This should show you how many duplicates your have, then you can manually remove the lines.

$ sudo -s
$ cd /etc/apt/
$ grep -rl packages.matrix.one/matrix-creator/ .

look through your sources list and remove the duplicate lines (most likely 2 lines)

sudo -s
sudo nano /etc/apt/sources.list

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