digikam 3.5 download very slow on Ubuntu 14.04

[asb3]

I recently upgraded from Ubuntu 13.04 to 14.04.

Since the upgrade, the rate at which digikam downloads images from the camera has decreased by a factor of 100.
Before the upgrade, the transfer rate was about 2 images/sec.
After the upgrade, the transfer rate is about 1 image/minute.

I submitted a bug report, and I got the following reply:
https://bugs.kde.org/show_bug.cgi?id=336022

Gilles Caulier <caulier.gilles@gmail.com> (caulier.gilles@gmail.com) changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |caulier.gilles@gmail.com
Resolution|--- |UPSTREAM

--- Comment #1 from Gilles Caulier <caulier.gilles@gmail.com> (caulier.gilles@gmail.com) ---
Nikon camera use Gphoto2 camera driver.

The dysfunction is clear : with same digiKam version running on different
Ubuntu releases, You see introduced time latency with last internal components.
This want mean that libgphoto, or libusb, has a problem (or another sub
library)...

Gilles Caulier

As a test, I downloaded gphoto2,which also uses libgphoto for downlods. When I executed
>gphoto2 --get-all-files
the files transfer rate was about 2 images/sec.

I tried and failed to submit a bug report using ubuntu-bug.