/etc/circos/tracks/link.conf is in circos 0.69.4+dfsg-1.
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 | ribbon = no
color = black
thickness = 1
radius = 0.40r
bezier_radius = 0r
crest = 0.5
bezier_radius_purity = 0.75
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