The files libnss-mysql-bg are a minor build update to keep
libnss-mysql-bg running on newer systems such as Debian 9 Stretch and
also Trisquel systems.  This is installed on Savannah systems up
through Trisquel 9 Etiona.

    libnss-mysql-bg_1.5-2.0~sv1_amd64.deb

MariaDB changed interfaces requiring more maintenance in Trisquel 10
Nabia.  This necessitated source code changes.  This is installed on
Savannah systems on Trisquel 11 Aramo.

    libnss-mysql_1.6.0-1_amd64.deb