FWIW, I flew off to a photo shoot, took my laptop, but forgot the power adapter (my laptop will not run long on a fully charged battery). As a work-around, I borrowed a laptop running Windows 10 and installed the Windows version of darktable. The lens correction module worked fine, and all of my Minolta/Sony AF lenses were detected without issue. When I got home, I booted my laptop into Windows 10, installed darktable, and, in that setup, again, my lenses were correctly detected by darktable’s lens correction module.
For now, I will conduct my darktable sessions from within Windows 10. I have tried uninstalling/purging/re-installing darktable in Ubuntu. No progress in solving the problem so far. I will take a break and concentrate on editing photos.
Regards,
Caruso