/usr/share/nx/keys/id_rsa is in ltsp-cluster-nxloadbalancer 2.0.3-0ubuntu1.
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 7 8 9 10 11 12 | -----BEGIN DSA PRIVATE KEY-----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-----END DSA PRIVATE KEY-----
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