Why doesn't apt-get work :(?

Question

linux

I put on raspbian, did apt-get update :(

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:
 php5-mysql : Depends: libmysqlclient18 but it is not installable

Answer 1

It says - php5-mysql : Depends: libmysqlclient18 but it is not installable
Cannot install libmysql* package

Answer 2

You need to look in the /etc/apt/sources.list file and the /etc/apt/sources.list.d folder - there are lists of repositories from which packages are downloaded