UBUNTU中安装依赖包，出现如下错误：
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/o/openjdk-8/openjdk-8-jdk_8u181-b13-1ubuntu0.18.04.1_amd64.deb 404 Not Found [IP: 91.189.91.23 80]
解决方法：
sudo -i
apt-get clean
cd /var/lib/apt
mv lists lists.old
mkdir -p lists/partial
apt-get clean
apt-get update
apt-get clean
cd /var/lib/apt
mv lists lists.old
mkdir -p lists/partial
apt-get clean
apt-get update
成功执行apt-get update， 便可以删除lists.old
https://ubuntuforums.org/archive/index.php/t-1910598.html