在Ubuntu12.04上安装Chromium

1. 下载并安装密钥
   wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - 
   或者下载linux_signing_key.pub后执行sudo apt-key add linux_signing_key.pub
2. 添加google chrome源
   sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' 
   即新建/etc/apt/sources.list.d/google.list文件，并加入如下内容：
   deb http://dl.google.com/linux/chrome/deb/ stable main
3. 安装browser
   sudo apt-cache search chromium