How can I delete a repository link on Ubuntu ?

Is there a way to delete wrong added repository link?

I did a mistake while 'sudo add-apt-repository ‘deb [arch=amd64,i386] http://wronglink trusty main’. (it was a mariadb command)

And I do not know how to delete it.

Do I edit /etc/apt/sources.list ? or … ?

It is hard for me. Please help.

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All apt repositories come from /etc/apt/sources.list and /etc/apt/sources.list.d/*. Assuming you added one via the MariaDB site, you can find that in /etc/apt/sources.list.d/ with the name MariaDB in it. Just delete that file and don’t forget to remove the key from apt. You can do that by running apt-key list and then apt-key del <key id>. Then just refresh your packages and you should be all set!