e il secondo comando mi dice questo

ns23866:/home/file# apt-cache search libmysql | grep dev
libmysql-ocaml-dev - OCaml bindings for MySql
libmysqlclient10-dev - LGPL-licensed client development files for MySQL databases
libmysqlclient12-dev - mysql database development files
libmysqlclient14-dev - mysql database development files