/usr/share/student-control-panel/users.conf is in thin-client-manager-backend 0.5.1-0ubuntu9.
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 | #Please use the following syntax
#
#Group Name=user1,user2
Default Group=
|