E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

问题：

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

原因：

待安装的app从当前的下载源中无法下载，需要更新app下载的源。

解决方法：

/etc/apt/sources.list 的国内源更新

更新后的源：

deb http://old-releases.ubuntu.com/ubuntu/ raring main universe restricted multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring main universe restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-security main universe restricted multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-security main universe restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-updates main universe restricted multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-updates main universe restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse

然后执行：

sudo apt-get clean
sudo apt-get update