火狐浏览器不安全问题

                                                                         **

火狐浏览器不安全问题

**
在树莓派上安装Ubuntu mate时火狐浏览器显示网络连接不安全，网上试了很多方法都不行，最后采用换源的方法成功解决。我下载的系统是Ubiquity Robotics制作的系统，以Ubuntu mate16.04为基础内嵌了ros，免去了ros的安装。

1.备份系统源：

cd /etc/apt
sudo mv sources.list sources.list_bak

2.打开源文件：

 sudo vi sources.list

添加以下内容在打开的文件中：
deb http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe

3.保存并且sudo apt-get update，更新成功
4.重启树莓派