$ gphoto2 --capture-image --debug --debug-logfile=j5-3.txt

*** Error ***
PTP I/O Error
ERROR: Could not capture image.
ERROR: Could not capture.

*** Error ***
PTP I/O Error

$ gphoto2 --auto-detect -v
...
gphoto2         2.5.27.1       gcc, popt(m), exif, no cdk, no aa, jpeg, readline
libgphoto2      2.5.30         standard camlibs (SKIPPING docupen lumix), gcc, no ltdl, EXIF
libgphoto2_port 0.12.1         iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi, gcc,no ltdl, EXIF, USB, serial without locking
Model                          Port
----------------------------------------------------------
Nikon J5                       usb:001,014