我使用的图像nginx是基于dockerfile/ubuntu。在附加到Docker容器的外壳上

docker exec -it <container_id> /bin/bash

我想这样做，git pull所以我尝试安装git但apt无法找到该软件包：

root@a71e45d5cd40:/# apt-get install git
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package git

我们如何git从该映像进行安装，为什么会丢失它？

猫/etc/apt/sources.list

deb http://httpredir.debian.org/debian wheezy main
deb http://httpredir.debian.org/debian wheezy-updates main
deb http://security.debian.org wheezy/updates main
deb http://nginx.org/packages/mainline/debian/ wheezy nginx

猫/etc/apt/sources.list.d/*

cat: /etc/apt/sources.list.d/*: No such file or directory

apt-cache麦迪逊git

N: Unable to locate package git