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Hopefully, the next Ubuntu LTS version (22.04), to be released in April, will contain an up to date SageMath (probably version 9.5). Meanwhile, you can still download the SageMath 9.4 binary for Ubuntu 20.04 by selecting a mirror from https://www.sagemath.org/download.html. For instance: https://www-ftp.lip6.fr/pub/math/sagemath/linux/64bit/index.html

Note that you have to install the Ubuntu package python-is-python3 first.