Ubuntu 18.04 is from April 2018, and installing SageMath with "apt-get install" you get the version of SageMath packaged at the time: SageMath 8.1, released 2017-12.
Sage has made tremendous progress since 8.1, including moving to Python 3 (instead of Python 2 which has now reached end of support). I would recommend installing SageMath 9.2 or later. This can be done using one of the following methods: - download a binary for Ubuntu 18.04 from https://www.sagemath.org/download-linux.html - install with Conda https://doc.sagemath.org/html/en/installation/conda.html - build from source https://doc.sagemath.org/html/en/installation/source.html - Use Docker or Podman (can someone point to a relevant webpage?) Please ask any follow-up question here. --Samuel -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/a0aed4cf-d049-4a57-8539-10a18b72bbebn%40googlegroups.com.
