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Apparently, there is an issue with the file permissions. If you don't need to have SageMath installed system wide, I would recommend to install it as an ordinary user (no root) in your home directory:

cd ~
git clone https://github.com/sagemath/sage.git
cd sage 
MAKE="make -j8" make 2>&1

should work, provided you have installed the prerequisites for Ubuntu-based systems.