Aruco marker crash (ubuntu14.4)

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Hello,

i want to detect markers and there position. I found the acuro markers and the ROS nodes that sounded promising. I found these two tutorials (one, two). Both seem to use the same package and almost the same launch file. But both tutorials seem to use a different Ubuntu (I'm using 14.04), since in my registry the following for example is not found (apt-get update already tried):

• sudo apt-get install ros-indigo-usb-cam
• the openCV-lib (can't find the terminal line anymore)

So i installed openCV with the help of one of the forum members (thanks again), but had to change some of the constants defined in openCV2 to the new ones used in openCV3 and also installed the usb-cam-lib. With the launch files of the tutorials i managed to get some images out of the cam (viewed in rviz) and even calibrated the cam with this tutorial (no mater how well it worked, at least i was able to finish all the steps):

roscore
> (everything normal here)

roslaunch my_robot usb_cam_stream.launch
> (...)
> Starting 'head_camera' (/dev/video0) at 640x480 via mmap (mjpeg) at 30 FPS
> [ WARN] [1532530276.439567317]: sh: 1: v4l2-ctl: not found
> [ WARN] [1532530276.443605906]: sh: 1: v4l2-ctl: not found

rostopic list 
> /rosout
> /rosout_agg
> /usb_cam/camera_info
> /usb_cam/image_raw
> /usb_cam/image_raw/compressed
> /usb_cam/image_raw/compressed/parameter_descriptions
> /usb_cam/image_raw/compressed/parameter_updates
> ...

Now to the part that's not working. So far everything was just the preparation for the real node from Arcuro. But when i start the launch file from one of the tutorials mentioned at the beginning, the following happens:

roslaunch aruco_ros single.launch 
> (...) 
> PARAMETERS
>  * /aruco_single/camera_frame: base_link
>  * /aruco_single/corner_refinement: LINES
>  * /aruco_single/image_is_rectified: True
>  * /aruco_single/marker_frame: aruco_marker_frame
>  * /aruco_single/marker_id: 582
>  * /aruco_single/marker_size: 0.034
>  * /aruco_single/reference_frame: aruco_ref_frame
>  * /rosdistro: indigo
>  * /rosversion: 1.11.21
> (...)
> core service [/rosout] found
> process[aruco_single-1]: started with pid [26729]
> [aruco_single-1] process has died [pid 26729, exit code -11, 
   cmd /home/lukas/catkin_ws/devel/lib/aruco_ros/single/camera_info:=/usb_cam/camera_info 
   /image:=/usb_cam/image_raw __name:=aruco_single 
   __log:=/home/lukas/.ros/log/f9e14154-8ffb-11e8-a1c7-14b31f1cb5de/aruco_single-1.log]. 
> log file: /home/lukas/.ros/log/f9e14154-8ffb-11e8-a1c7-14b31f1cb5de/aruco_single-1*.log
> all processes on machine have died, roslaunch will exit
> shutting down processing monitor...
> ... shutting down processing monitor complete

Even when i try to start the node directly it's not working:

rosrun aruco_ros single 
> Segmentation fault (core dumped)

which is one of the most useless errors i got in the last weeks - so short. Google told me that it might be some errors/warnings during catkin_make, but no errors at all and warnings occur only at nodes i wrote myself and are not launched right now, nor required by the aruco's nodes.

Anybody has a hint, what's going wrong? How can i find out what the real error is?

Like the last time: Thanks everybody reading through this and for every help. Lukas