All occurrences of mysql-server in depends, recommends or suggests should be replaced with:
mysql-server | virtual-mysql-server ..as announced by James Page in Misc Developer News #37 (https://lists.debian.org/debian-devel-announce/2014/11/msg00015.html). Alternatively, if you prefer MariaDB, then the line could say: Depends/Recommends/Suggests: mariadb-server | virtual-mysql-server -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
