/usr/lib/plplot5.10.0/driversd/gd.driver_info is in plplot12-driver-gd 5.10.0-0ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | png:PNG file:0:gd:39:png
jpeg:JPEG file:0:gd:40:jpeg
gif:GIF file:0:gd:47:gif
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