Why wstool update never finishes?

edit

I am trying to use wstool to fetch a couple of packages from github, but when I try to update it gets stuck at "Cloning into" and never finishes... What could be wrong? Is the package incompatible somehow, should it even work?

 $ wstool update -t src
Prepare updating git://github.com/ktossell/libuvc_ros.git (version master) to /home/nlw/ros_catkin_ws/src/libuvc_ros
Url git@github.com:ktossell/libuvc_ros.git does not match git://github.com/ktossell/libuvc_ros.git requested.
  (d)elete and replace, (a)bort, (b)ackup and replace, (s)kip: d
[actionlib] Updating /home/nlw/ros_catkin_ws/src/actionlib
[actionlib] Done.
[angles] Updating /home/nlw/ros_catkin_ws/src/angles
[angles] Done.
[basler_camera] Fetching git://github.com/shadow-robot/basler_camera (version master) to /home/nlw/ros_catkin_ws/src/basler_camera
Cloning into '/home/nlw/ros_catkin_ws/src/basler_camera'...