Fix to cleanup in Setup

Author: brobey

Setup.Ubuntu20.04

@@ -71,7 +71,7 @@ sudo apt-get -qq update && \
 # Vendor OpenCL
 sudo apt-get -qq install -y mesa-opencl-icd
 
-sudo apt-get clean && rm -rf /var/lib/apt/lists/*
+sudo apt-get clean && sudo rm -rf /var/lib/apt/lists/*
 
 make clean
 make