Ubuntu更换软件源

Ubuntu更换软件源sources.list
1.切换到root用户
2.用文本编辑器打开sources.list,手动更换新源
leafpad /etc/apt/sources.list
3.更换完毕后执行下面的更新指令，进行系统或者工具的更新
apt-get update && apt-get upgrade && apt-get dist-upgrade

PS：要点：需注意区分版本，
先确定自己是什么版本：lsb_release -a

Ubuntu18.1.png

例如deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic main restricted universe multiverse，中cosmic是Ubuntu18.1的，如果是其他的，直接替换掉即可。

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摘自：清华源
Ubuntu 镜像使用帮助
Ubuntu 的软件源配置文件是 /etc/apt/sources.list。将系统自带的该文件做个备份，将该文件替换为下面内容，即可使用 TUNA 的软件源镜像。
选择你的ubuntu版本:18.1

# 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/ cosmic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-security main restricted universe multiverse

# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ cosmic-proposed main restricted universe multiverse