## Installing nginx using official repo

下載並新增 `nginx_signing.key`：
```bash
wget http://nginx.org/keys/nginx_signing.key
sudo apt-key add nginx_signing.key
```

新增 `/etc/apt/sources.list.d/nginx.list`：
```
deb http://nginx.org/packages/ubuntu/ precise nginx
deb-src http://nginx.org/packages/ubuntu/ precise nginx
```

移除舊版 nginx，安裝新版 nginx：
```bash
sudo apt-get remove --purge nginx-*
apt-get update
apt-get install nginx
service nginx restart
```