/usr/share/pstoedit/unix.fmp is in pstoedit 3.70-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | % *nix specific system font map file
% to be enriched later with system specific font name redirections
% (based on a proposal by Scott Pakin)
|