uos换源

Qter

https://blog.csdn.net/qq_45881659/article/details/123215595

一：问题描述：
在使用ssh localhost链接本地时，提示端口22拒绝链接，如图：


然后就是安装ssh并且设置root用户免密登录。在这个过程中出现了问题：

命令执行完成之后，执行ssh localhost还是失败，所以只有更新源，执行命令：apt-get update.
执行完命令之后出现的两个问题：
1.网络不可达

这个问题只需要ping一下百度（其他网址应该也可以）就可以解决。
2.ping通之后出现的问题

这里使用以下命令可以解决，但是治标不治本：
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
而且如果出现 gpg: 从公钥服务器接收失败：Server indicated a failure 那个最好的解决办法就是直接换源。

二.给UOS系统换源
参考文档：给uos系统更换国内源

1.备份配置文件

cp /etc/apt/sources.list{,.bak}
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2.更换源

vim /etc/apt/sources.list
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删除文件全部内容之后，添加上新的源，我更换的是阿里源
1>.阿里源

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
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2>.清华源

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

3.更新源

更新软件列表
apt-get update
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更新软件
apt-get upgrade
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三.更换源之后的问题

如果出现上图的问题，执行下述命令解决

apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 3B4FE6ACC0B21F32
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然后再次执行apt-get update.


问题解决！！！
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版权声明：本文为CSDN博主「buyanf」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_45881659/article/details/123215595

Qter

cp filename{,.bak}

这个命令是用来把filename备份成filename.bak的

等同于命令

cp filename filename.bak

这里利用的是bash的brace expansion（大括号扩展）功能

按照bash手册(man bash)所述

bash支持{a,b,c}这样的扩展

比如a{d,c,b}e会被扩展成ade ace abe

Qter

备份配置文件
sudo cp /etc/apt/sources.list{,.bak}

更换源
## 删除全部内容之后，添加上新的源
vim /etc/apt/sources.list

下面是常用的国内源
1）阿里源：
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

2）清华源：
# 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/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

更新源
更新软件列表
sudo apt-get update

更新软件（将已安装的软件与刷新的软件列表中的软件版本进行对比，如果发现已安装的软件版本太低，就会提示更新）
sudo apt-get upgrade

Qter

/etc/apt/sources.list
/etc/apt/sources.list.d/