/usr/share/sadms-2.0.15/conf/_user.map is in sadms 2.0.15.repack-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # user.map
# SAMBA USERMAP FILE
# SADMS
# 2005-06-20
# Unix_name = SMB_name1 SMB_name2 ...
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