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Since it seems you are running Ubuntu 16.04, I would advise to install the latest version (8.9) from scratch by downloading the binary tar ball from https://www.sagemath.org/download-linux.html.

After having downloaded the tar.bz2 file in your home directory, it suffices to run

bunzip2 sage-8.9-Ubuntu_16.04-x86_64.tar.bz2
tar xvf sage-8.9-Ubuntu_16.04-x86_64.tar
cd SageMath
./sage -n jupyter