Hi,
I tried to reproduce your error, but was not able to do so. I created a new Build Environment (with ctrlX WORKS V1.20) and executed the scripts "install-sdk.sh" and "install-dotnet-sdk.sh". The scripts got executed without an error and also "sudo apt-get update" works afterwards without an error for me.
When I look at your error message, I can only recommend the things you already tried.
Which version of ctrlX WORKS did you use, also the latest V1.20?
... View more