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Ubuntu是以桌面应用为主的GNU/Linux开源操作系统，官方译名“友邦拓”，另有“乌班图”等译名。Ubuntu每6个月会发布一个新版本，每两年会推出一个长期支持（Long Term Support，LTS）版本，一般支持3年时间。
Ubuntu相关的镜像很多，这里只搜索评星50以上的镜像：
root@ubuntu:~# docker search --filter=stars=50 ubuntu
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating sys… 9261 [OK]
dorowu/ubuntu-desktop-lxde-vnc Docker image to provide HTML5 VNC interface … 274 [OK]
rastasheep/ubuntu-sshd Dockerized SSH service, built on top of offi… 205 [OK]
consol/ubuntu-xfce-vnc Ubuntu container with "headless" VNC session… 157 [OK]
ubuntu-upstart Upstart is an event-based replacement for th… 96 [OK]
ansible/ubuntu14.04-ansible Ubuntu 14.04 LTS with ansible 96 [OK]
neurodebian NeuroDebian provides neuroscience research s… 56 [OK]
下载镜像，这里下载的是最新版本的镜像：
root@ubuntu:~# docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
6cf436f81810: Pull complete
987088a85b96: Pull complete
b4624b3efe06: Pull complete
d42beb8ded59: Pull complete
Digest: sha256:7a47ccc3bbe8a451b500d2b53104868b46d60ee8f5b35a24b41a86077c650210
Status: Downloaded newer image for ubuntu:latest
启动容器：
root@ubuntu:/# docker run -it ubuntu bash
root@2d7c5e1c06d8:/#查看ubuntu镜像的发行版本号：
root@2d7c5e1c06d8:/# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"执行apt-get update命令更新仓库信息，之后便可以通过apt-get命令安装软件：
root@2d7c5e1c06d8:/# apt-get update
Get:1 http://mirrors.aliyun.com/ubuntu xenial InRelease [247 kB]
Get:2 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease [109 kB]
Get:3 http://mirrors.aliyun.com/ubuntu xenial-security InRelease [109 kB]
Get:4 http://mirrors.aliyun.com/ubuntu xenial/main Sources [1103 kB]
Get:5 http://mirrors.aliyun.com/ubuntu xenial/universe Sources [9802 kB]
Ign:6 https://download.docker.com/linux/ubuntu xenial InRelease
Err:7 https://download.docker.com/linux/ubuntu xenial Release
Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. Could not handshake: Error in the certificate verification. [IP: 143.204.15.70 443]
Get:8 http://mirrors.aliyun.com/ubuntu xenial/main amd64 Packages [1558 kB]
Get:9 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 Packages [9827 kB]
Get:10 http://mirrors.aliyun.com/ubuntu xenial-updates/universe Sources [315 kB]
Get:11 http://mirrors.aliyun.com/ubuntu xenial-updates/main Sources [418 kB]
Get:12 http://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 Packages [951 kB]
Get:13 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 Packages [1189 kB]
Get:14 http://mirrors.aliyun.com/ubuntu xenial-security/universe Sources [126 kB]
Get:15 http://mirrors.aliyun.com/ubuntu xenial-security/main Sources [179 kB]
Get:16 http://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 Packages [544 kB]
Get:17 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 Packages [795 kB]
Reading package lists... Done
W: https://download.docker.com/linux/ubuntu/dists/xenial/InRelease: No system certificates available. Try installing ca-certificates.
W: https://download.docker.com/linux/ubuntu/dists/xenial/Release: No system certificates available. Try installing ca-certificates.
E: The repository 'https://download.docker.com/linux/ubuntu xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
如果下载速度太慢，可以更新一下软件源。编辑/etc/apt/sources.list，修改为如下内容：
deb http://mirrors.aliyun.com/ubuntu/ xenial main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
# deb-src [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe
之后再执行命令即可。
安装curl工具：
root@2d7c5e1c06d8:/# apt-get install curl
Reading package lists... Done
Building dependency tree
Reading state information... Done
.......