ubuntu安装不了php5是因为ubuntu16.04官方软件库中没有php5，只自带php7，其解决办法就是安装14.04或者使用PPA即可。
在ubuntu16.04下无法安装php5问题解决
由于之前的项目是用php5写的，想要部署在升级到ubuntu16.04的系统上就要安装php5版本，运行下列命令后发现如下提示：
lhs@taing:/var/www/html$ sudo apt-get install php5 Reading package lists... Done Building dependency tree Reading state information... Done Package php5 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'php5' has no installation candidate lhs@taing:/var/www/html$ sudo apt-get install libapache2-mod-php5 Reading package lists... Done Building dependency tree... 50% Building dependency tree Reading state information... Done Package libapache2-mod-php5 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'libapache2-mod-php5' has no installation candidate
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