ubuntu更换国内yum源

ubuntu执行apt-get update命令失败报错 ssh openssh vim 等命令安装失败报错 这时需要更换国内的源   报错如下
E: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/xenial/InRelease 明文签署文件不可用，结果为‘NOSPLIT’（您的网络需要认证吗？）

E: unable to download http://cn.archive.ubuntu.com/ubuntu/dists/xenial/InRelease expressly signed file is not available, the results for 'NOSPLIT (your network need certification?

E: 仓库 “http://cn.archive.ubuntu.com/ubuntu jammy InRelease” 没有数字签名。
N: 无法安全地用该源进行更新，所以默认禁用该源。
N: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。

E: warehouse "http://cn.archive.ubuntu.com/ubuntu jammy InRelease" no digital signature.
N: This source cannot be safely updated, so it is disabled by default.
N: See the apt-secure(8) manual for details on warehouse creation and user configuration.

下面更换国内的科大源

1. 备份系统自带的源

sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak

2.查看系统版本

cat /etc/issue

即当前版本为22.04

3.更新日期和时间

格式为“YYYY-MM-DD HH:MM:SS”

 sudo date -s “2022-01-01 12:00:00”       

 

4. 在sources.list中更换成科大源

科大官网地址          Ubuntu - USTC Mirror Help

ubuntu 16.04

# 默认注释了源码仓库，如有需要可自行取消注释
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse

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

ubuntu18.04

# 默认注释了源码仓库，如有需要可自行取消注释
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse

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

ubuntu 20.04

# 默认注释了源码仓库，如有需要可自行取消注释
deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse

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

ubuntu 22.04

# 默认注释了源码仓库，如有需要可自行取消注释
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse

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

ubuntu 24.04     

# 默认注释了源码仓库，如有需要可自行取消注释
deb https://mirrors.ustc.edu.cn/ubuntu/ noble main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ noble-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ noble-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ noble-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ noble-backports main restricted universe multiverse

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

 ubuntu24.10     

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

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

这里根据自己的系统版本来选择源 这里以22.04为例

因为ssh无法连接手输入太慢 可以拿个U盘新建一个文本文档.txt文件（修改文件名 不要是中文 这里修改的为a.txt）将源复制到该文本文档里

1）将U盘插到这台ubuntu系统的设备中

sudo fdisk -l

2）查看U盘设备名 这里可以看到U盘是一个28.7G的 设备名为/dev/sdb4

3）添加一个挂载点

sudo mkdir /mnt/usb

4) 临时将U盘挂载到 /mnt/usb中

sudo mount /dev/sdb4 /mnt/usb 

5）查看是否挂载成功

df -h

这里显示已将U盘挂载到 /mnt/usb中

6）打开U盘 并查看该文件

cd /mnt/usb

ls

可以查看到科大源的配置文件 a.txt

7）复制a.txt的文件到sources.list文件中

sudo cp /mnt/usb/a.txt /etc/apt/sources.list

8)查看是否复制成功

cat /etc/apt/sources.list

查看输出内容已经复制成功

5. 更新源

sudo apt-get update

提示更新完成

安装ssh 测试没有问题

sudo apt install openssh-server