/usr/bin/dbsessmgr2 is in mono-xsp2 3.8-2.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#!/bin/sh exec /usr/bin/mono $MONO_OPTIONS "/usr/lib/xsp/2.0/dbsessmgr2.exe" "$@"