File '/usr/bin/mariadb_config' has been moved from Debian package
libmariadbd-dev to libmariadb-dev since MariaDB version 10.2
this leads to situation where upgrade will no succeed but fail
with this kind of error message

 * trying to overwrite '/usr/bin/mariadb_config', which is also in package libmariadbd-dev 1:10.2.44+maria~bionic

Add libmariadbd-dev to libmariadb-dev Debian control files
'Breaks' solve situation and upgrading won't error anymore