Hello,
This problem come because the python version in the sc20 SDK is outdated. If you have a look at the log file, you will see the impossibility to download the six package from the python package repo. It’s planned since 2017… URL is now updated and the old one in no longer available.
I’m using python from the meta-openembedded layer, using the rocko branch. I’m increasing the layer priority to be sure to use it instead of the sc20 SDK version.