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You seem to be doing contractictoty things:

• when you write tar -xjf *.tar.bz2, you seem to be willing to install Sage from some binaries downloaded from Sage website.

• when you write apt install sagemath-common, you seem to be willing to install Sage from Ubuntu repositories, but then you should install sagemath-jupyter, because sagemath-common only ships some file that are common to all arcitectures (in particular, it does not provide compiled files, which are required).

Which Sage do you want to install ?

If you want to install six, you should do that as a normal user, with the command pip install --user six. In the example you gave, you are running the pip command as root, wich is not advised, and which probably explains the error messages you get.