/usr/lib/erlang/releases/RELEASES.src is in erlang-src 1:20.2.2+dfsg-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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[{release,"Erlang/OTP","20","9.2",
[{kernel,"5.4.1","%ERL_ROOT%/lib/kernel-5.4.1"},
{stdlib,"3.4.3","%ERL_ROOT%/lib/stdlib-3.4.3"},
{sasl,"3.1.1","%ERL_ROOT%/lib/sasl-3.1.1"}],
permanent}].
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