我的 Raspberry Pi 3 有问题。当我尝试运行时apt-get update，出现 404 未找到错误。我对 Linux 很陌生，不知道出了什么问题。
这是错误代码：
pi@raspberrypi:~ $ sudo apt-get update
Ign http://mirrordirector.raspbian.org jessie InRelease
Ign http://archive.raspbian.org jessie InRelease
Hit http://archive.raspberrypi.org jessie InRelease
Ign http://archive.raspbian.org jessie Release.gpg
--*cut*--
W: Failed to fetch http://mirrordirector.raspbian.org/raspbian/dists/jessie/rpi/binary-armhf/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
pi@raspberrypi:~ $
我的/etc/apt/sources.list文件如下所示：
pi@raspberrypi:~ $ sudo apt-get update
Ign http://mirrordirector.raspbian.org jessie InRelease
Ign http://archive.raspbian.org jessie InRelease
Hit http://archive.raspberrypi.org jessie …