linux 安装php时遇到问题无法定位软件包 php-mysql
经查找 是源的问题 改为阿里云的源即可
过程：
（1）备份原始文件
sudo cp /etc/apt/sources.list /etc/apt/sources_copy.list
（2）修改文件source.list 注释原语句，并复制
deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
其中 jammy为虚拟机版本代号，在原始语句（被注释的语句）中相同位置上有该代号，照用即可，或者
lsb_release -a
该命令可查找虚拟机版本号，Codename即是我们要找的内容 替换jammy
（3）更新源
sudo apt-get update
（4）重新安装包
sudo apt install php-curl