执行命令

美国源为例，阿里源改为http://mirrors.aliyun.com/debian/即可

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echo 'deb http://ftp.us.debian.org/debian/ testing main' | sudo tee /etc/apt/sources.list.d/testing.list
sudo apt-get update && apt-get -y upgrade
sudo apt-get -y dist-upgrade && sudo reboot  # 可选

参考链接

https://wiki.debian.org/DebianTesting