How can I get the Sage version 9 on ubuntu?

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Hi,

I used 'sudo apt-get install sagemath' in the ubuntu shell to get Sage. However, it installed version 8.1 of Sage.

I would like to install a version of Sage that has automatic syntax highlighting/coloring like version 9 has.

Anyone know how I can do this? I need to do it using the command line only (see below).

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Some additional context:

I installed sage on ubuntu 18.04 on windows 10 using its Linux bash shell . I'm able to access the Sage running on Ubuntu (on Windows) by going to localhost:8080 on chrome (in Windows).