apt testing source

/etc/apt/sources.list

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deb http://http.us.debian.org/debian/ testing non-free contrib main
#deb http://http.us.debian.org/debian/ stable non-free contrib main
#deb http://http.us.debian.org/debian/ unstable non-free contrib main
#deb http://http.us.debian.org/debian/ wheezy non-free contrib main
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#apt edit-sources
apt update

NO_PUBKEY 04EE7237B7D453EC NO_PUBKEY 648ACFD622F3D138

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apt-key adv --keyserver keyserver.ubuntu.com --recv 04EE7237B7D453EC
apt-key adv --keyserver keyserver.ubuntu.com --recv 648ACFD622F3D138

ubuntu repo names

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wheezy: debian 7.0
xenial: Ubuntu 16.04
focal: Ubuntu 20.04

refer to:
https://serverfault.com/questions/550855/how-to-add-debian-testing-repository-to-apt-get
https://yunwei365.blog.csdn.net/article/details/114930145