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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
+deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
+deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
+deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
+
+# 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
+deb http://security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
+# deb-src http://security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
+
+# 预发布软件源，不建议启用
+# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
+# # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
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