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Let's check the default permission of /etc/apt/sources.list: -rw-rw-r-- 1 root root 2563 Aug 21 04:24 /etc/apt/sources.list As you can see only user root and the members of group root can write to the file, all other users while trying to edit the file will get a message saying that the file is read only for them. To edit the file, just use sudo to ...


You do not have yo edit the /etc/apt/sources.list manually. You can go to System Settings -> Software & Updates and setup your mirror there in GUI. It is "Download from" drop down menu.

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