/etc/bluetooth/serial.conf is in bluez 4.98-2ubuntu7.
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 | # Configuration file for serial
# There could be multiple proxy sections, the format is [Proxy <user chosen name>]
#[Proxy DUN]
# UUID for DUN proxy service
#UUID=00001103-0000-1000-8000-00805F9B34FB
# Address for device node
#Address=/dev/ttyx
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