Hello @mirots ,
Seth here. This is awesome! Nice and nice all over again.
I am glad you are showing interest in this process. I slacked off years ago when people were producing the images for ROS.
Maybe some udev rules will help: customizations/etc/udev/rules.d at master · beagleboard/customizations · GitHub
Seth
P.S. Also, I think there are a couple of commands to set the debian:debian user for accessing specific libs. but in your case ubuntu:ubuntu.
https://help.ubuntu.com/community/FilePermissions
If that does not give enough info, please view this too: