Re: limesdr not seen (docker on ubuntu)
I think you missed the udev rules thing. You still need it either in the Docker host or the Virtualbox guest.
For Docker, in a VBox guest replace "host" by "guest":
"In order to be able to access the USB hardware on the host the udev rules must be properly set for your user (or system wide) on the host. The udev-rules folder in the SDRangel Github repository contains these rules and a script to install them to be run with