ubuntu切换国内软件安装源

总所周知的原因，国内的网络在访问一些国外软件源的时候速度会比较慢，庆幸的是很多大公司都提供了软件源镜像，对于ubuntu的软件源镜像，我们只需要配置sources.list即可.

首选需要确定ubuntu的版本，这个很关键
lsb_release -c

Codename:       bionic

这个bionic就是版本号，下面修改的sources.list的时候替换成此处的版本号即可。

1. sudo vim /etc/apt/sources.list

2. 删除原有内容

3. 粘贴下面内容

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

4. 更新

sudo apt update 
sudo apt upgrade