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spark debian package should be renamed to something like 'spark-messenger' since 'spark' package has appeared in debian testing and unstable as 'SPARK programming language toolset', see http://packages.debian.org/testing/main/spark
...IGHTLYDEB-154/artifact/Debian/spark_2.6.0_all.deb
debian package is called spark_2.6.0_all.deb
spark debian package should be renamed to something like 'spark-messenger' since 'spark' package has appeared in debian testing and unstable as 'SPARK programming language toolset', see http://packages.debian.org/testing/main/spark