Ubuntu环境常见问题＜一＞_used fallback datasource-优快云博客

本文提供了一步一步指导如何为 Ubuntu 18.04 更换阿里云镜像源的方法，包括备份原始源、编辑源列表、更新软件包索引及安装常用 SSH 工具等内容。

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换源

备份原版

sudo cp /etc/apt/sources.list /etc/apt/sources_init.list

换源

sudo gedit /etc/apt/sources.list

# 阿里源 （Ubuntu 18.04）
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src 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-backports main restricted universe multiverse

同步

sudo apt-get update
sudo apt-get -f install
sudo apt-get upgrade

域名解析

gedit /etc/resolv.conf

使用阿里巴巴提供的DNS域名解析

nameserver 8.8.8.8 
nameserver 8.8.4.4
nameserver 223.5.5.5
nameserver 223.6.6.6

远程连接

安装ssh

#客户端
sudo apt-get install openssh-client
#服务器
sudo apt-get install openssh-server

启动服务

sudo /etc/init.d/ssh start

修改配置文件

sudo vim /etc/ssh/sshd_config

找到PermitRootLogin without-password在其下一行添加PermitRootLogin yes后重启服务。

service ssh restart