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				-deb http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse
 
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				-deb http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse
 
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				-deb http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse
 
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				-deb http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse
 
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				-deb http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse
 
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				-deb-src http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse
 
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				-deb-src http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse
 
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				-deb-src http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse
 
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				-deb-src http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse
 
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				-deb-src http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse 
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				+# 默认注释了源码镜像以提高 apt update 速度,如有需要可自行取消注释
 
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				+deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble main restricted universe multiverse
 
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				+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble main restricted universe multiverse
 
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				+deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
 
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				+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
 
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				+deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
 
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				+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
 
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				+
 
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				+# 以下安全更新软件源包含了官方源与镜像站配置,如有需要可自行修改注释切换
 
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				+deb http://security.ubuntu.com/ubuntu/ noble-security main restricted universe multiverse
 
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				+# deb-src http://security.ubuntu.com/ubuntu/ noble-security main restricted universe multiverse
 
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				+
 
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				+# 预发布软件源,不建议启用
 
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				+# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-proposed main restricted universe multiverse
 
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				+# # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ noble-proposed main restricted universe multiverse 
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