The GD library can be compiled with or without JPEG, XPM, PNG, Freetype, etc.
Likewise for the GD module (which has some config options when you compile it.
The config script asks for JPEG, Freetype, and XPM support options; if you didn't answer yes for the JPEG, you don't get support.
Anyway, does this work? (provide your own JPEG filename):
use strict;
use GD;
my $img = GD::Image->newFromJpeg("/home/ned/Champagne.jpg");
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