Ubuntu 换yum源

Ubuntu系统自带的是国外的源，咱们国内用户使用的时候下载文件特别的慢，所以我们需要更换国内镜像源。

非图形化系统

更改root密码

sudo passwd root

备份源

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

进入源文件，修改镜像链接信息

sudo gedit /etc/apt/sources.list

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

更新下软件库

# 命令会访问源列表里的每个网址，并读取软件列表，将其保存在本地
sudo apt-get update

# 命令会更新本地已安装的软件
sudo apt-get upgrade

图形化系统

进入下角软件库,打开软件和更新

选择国内站点

更新下软件库

sudo apt-get update
sudo apt-get upgrade