/etc/partimaged/partimagedusers is in partimage-server 0.6.8-2.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Add all users which shall be allowed to connect to the partimage server.
# One user per line. See "man partimagedusers" for more information.
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