我一直在尝试安装php5-mysql以运行自己的云服务器，但每次我尝试它都会显示依赖性错误，请在此处查看：
pi@raspberrypi:/var/www/html $ sudo apt-get install php5-mysql
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
php5-mysql : Depends: libmysqlclient18 but it is not installable
E: Unable to correct problems, you have held broken packages.
我正在输入命令sudo apt-get install php5-MySQL。我已经找了依赖，但到目前为止还没有找到它并尝试使用synaptic安装它，但它显示相同的错误。我是否需要使用不同的东西，因为这已经过时或已被删除？我跟随在我的pi上运行owncloud的教程可用here
如果我需要提供任何细节，我会这样做，我只想知道如何在raspberry pi上获得该依赖关系或者对于owncloud的合适替代方案。