/usr/share/matplotlib/mpl-data/stylelib/seaborn-dark-palette.mplstyle is in python-matplotlib-data 2.1.1-2ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Seaborn dark palette
axes.prop_cycle: cycler('color', ['001C7F', '017517', '8C0900', '7600A1', 'B8860B', '006374'])
patch.facecolor: 001C7F
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