本镜像仅包含 32/64 位 x86 架构处理器的软件包，在 ARM(arm64, armhf)、PowerPC(ppc64el)、RISC-V(riscv64) 和 S390x 等架构的设备上（对应官方源为 ports.ubuntu.com）请使用 ubuntu-ports 镜像。
将系统自带的对应文件做个备份，然后根据格式的选择下面对应的内容替换，即可使用选择的软件源镜像。
/etc/apt/sources.list）# 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.bfsu.edu.cn/ubuntu/ resolute main restricted universe multiverse
# deb-src https://mirrors.bfsu.edu.cn/ubuntu/ resolute main restricted universe multiverse
deb https://mirrors.bfsu.edu.cn/ubuntu/ resolute-updates main restricted universe multiverse
# deb-src https://mirrors.bfsu.edu.cn/ubuntu/ resolute-updates main restricted universe multiverse
deb https://mirrors.bfsu.edu.cn/ubuntu/ resolute-backports main restricted universe multiverse
# deb-src https://mirrors.bfsu.edu.cn/ubuntu/ resolute-backports main restricted universe multiverse
# 以下安全更新软件源为官方源配置
deb http://security.ubuntu.com/ubuntu/ resolute-security main restricted universe multiverse
# deb-src http://security.ubuntu.com/ubuntu/ resolute-security main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.bfsu.edu.cn/ubuntu/ resolute-proposed main restricted universe multiverse
# # deb-src https://mirrors.bfsu.edu.cn/ubuntu/ resolute-proposed main restricted universe multiverse/etc/apt/sources.list.d/ubuntu.sources）Types: deb
URIs: https://mirrors.bfsu.edu.cn/ubuntu
Suites: resolute resolute-updates resolute-backports
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
# 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
# Types: deb-src
# URIs: https://mirrors.bfsu.edu.cn/ubuntu
# Suites: resolute resolute-updates resolute-backports
# Components: main restricted universe multiverse
# Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
# 以下安全更新软件源为官方源配置
Types: deb
URIs: http://security.ubuntu.com/ubuntu/
Suites: resolute-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
# Types: deb-src
# URIs: http://security.ubuntu.com/ubuntu/
# Suites: resolute-security
# Components: main restricted universe multiverse
# Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
# 预发布软件源，不建议启用
# Types: deb
# URIs: https://mirrors.bfsu.edu.cn/ubuntu
# Suites: resolute-proposed
# Components: main restricted universe multiverse
# Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
# # Types: deb-src
# # URIs: https://mirrors.bfsu.edu.cn/ubuntu
# # Suites: resolute-proposed
# # Components: main restricted universe multiverse
# # Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg因镜像站同步有延迟，可能会导致生产环境系统不能及时检查、安装上最新的安全更新，不建议替换 security 源。
