Curiously, ufraw-batch seems to actually create the requested JPG file just fine. It seg-faults immediately after, though. I suspect that this may have something to do with the lens that I used being fully-manual: I had to go into the camera settings and enable operation "without a lens attached." Note that --lensfun=none had no effect on the seg fault.
ben@anteater:~$ ufraw-batch --version ufraw-batch 0.22 EXIV2 enabled. JPEG enabled. JPEG2000 (libjasper) disabled. TIFF enabled. PNG enabled. FITS disabled. ZIP enabled. BZIP2 enabled. LENSFUN enabled. ben@anteater:/media/ben/User File Storage/Pictures/Cora-Second-Christmas$ ufraw-batch DSC03626.ARW --out-type=jpg --out-path=jpg/ ufraw-batch: Loaded DSC03626.ARW ufraw-batch: overwrite 'jpg/DSC03626.jpg'? [y/N] y ufraw-batch: Saved /media/ben/User File Storage/Pictures/Cora-Second-Christmas/jpg/DSC03626.jpg Segmentation fault (core dumped)