RFNoC image builder problem

[Dobler, Anton]

Dear community, 

I am running UHD4.2 on Ubuntu 20.04. When I try to run rfnoc_image_builder, I 
get the following error:

rfnoc_image_builder --help
Traceback (most recent call last):
  File "/usr/local/bin/rfnoc_image_builder", line 29, in <module>
    from uhd.imgbuilder import image_builder
ImportError: cannot import name 'image_builder' from 'uhd.imgbuilder' (unknown 
location)

What is the issue here? I tried UHD4.1 but got the same issue here... 

Any help is very appreciated!

BR,

Anton