Docker容器：更换apt镜像源的方法/apt-get安装或者更新失败的解决方法

下面以ubuntu为例，更换镜像源文件/etc/apt/sources.list（这里的文件路径是在容器主路径下执行命令时的绝对路径，镜像使用的是阿里云）。

1.可将sources.list源文件先备份（方便回档），如使用命令：

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

2.然后创建文件/etc/apt/sources.list（可先在本地创建后移动过去），内容为

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

这时，镜像源已经配置好了，可以快速进行update、install等操作。