Install Mysql client driver linux

Unfortunately some recent changes in Ubuntu made things a bit more difficult...

• First find the driver (something like /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21) :

 sudo find / libmysql*.* | grep libmysql

• if not found, try to install it, and retry.

 sudo apt-get install libmysqlclient*

• then run the command line, replacing the 2nd file by the driver path found before.

 sudo ln -s /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21  /usr/lib/mysqlclient.so 

• another way is to register later in Gestinux database configuration the filename found.