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Hedley Finger
Asked: 2022-10-01 22:44:39 +0800 CST

Ubuntu 20.04 Utility to fix W: Duplicate sources.list entry

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I get "W: Duplicate sources.list entry" messages when using the ~$ sudo apt install or ~$ sudo apt update commands. These are caused by duplicate sources listed in /etc/apt/sources.list and in the /etc/apt/sources.list.d/*.list files.

Does anybody know of a CLI or GUI utility that makes it easier to clean up these duplicates? It is very tedious to open and close each file in sources.list.d/ looking for and fixing duplicate entries. Searches in AskUbuntu and on the web have so far produced nothing.

apt

1 Answers

  1. The utility add-apt-repository is aimed at adding or removing repositories into /etc/apt/sources.list or /etc/apt/sources.list.d. Besides, Ubuntu has a graphical tool, "Software and updates", that allows adding/removing a repository.

    The file /etc/apt/sources.list and the contents in /etc/apt/sources.list.d may also be edited manually.

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