1、apt-get update 404

修改/etc/apt/sources.list里面的内容 deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

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

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

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

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

2、RVM 及ruby bundle rails 安装

http://quangelab.com/rails-setup/

###3、RVM is not a function, selecting rubies with ‘rvm use …’ will not work.

终端右键配置文件—-配置文件首选项—标题和命令—-命令—以登录shell方式运行命令

docker 安装

通过系统自带包安装（可能不是最新版）

$ sudo apt-get update 
$ sudo apt-get install -y docker.io 
$ sudo ln -sf /usr/bin/docker.io /usr/local/bin/docker 

1. 通过Docker源安装最新版本

$ sudo apt-get install apt-transport-https 
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9 
$ sudo bash -c "echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list" 
$ sudo apt-get update 
$ sudo apt-get install lxc-docker

#####免 sudo 使用 docker

如果还没有 docker group 就添加一个：

sudo groupadd docker

将用户加入该 group 内。然后退出并重新登录就生效啦。

sudo gpasswd -a ${USER} docker

重启docker服务

sudo service docker restart

切换当前会话到新 group 或者重启 X 会话

newgrp - docker

pkill X