在Ubuntu 16.04 中默认无法安装php5，只能安装php7，直接用如下命令
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sudo apt-get install php5-mysql |
会提示
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Package php5-mysql 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-mysql' has no installation candidate |
按照这个文章中给出的解决方法，执行以下指令
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sudo apt-get purge `dpkg -l | grep php| awk '{print $2}' |tr "\n" " "` sudo add-apt-repository ppa:ondrej/php sudo apt-get update |