tags 968854 + moreinfo thanks libmysqld is no longer part of MySQL and so libmysql-dev is no longer a binary source package produced by MySQL packaging. src:mysql-8.0 does not produce libmysqld-dev. The libmysqld-dev package in unstable is left over from src:mysql-5.7 which needs to be removed.
Why are you trying to install libmysqld-dev from unstable?
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