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I would suggest that you install Sage in your home directory by downloading the binary image for Ubuntu 20.04 from https://www.sagemath.org/download-linux.html. Simply do

sudo apt-get install python-is-python3
tar jxvf sage-9.4-Ubuntu_20.04-x86_64.tar.bz2
cd SageMath
./sage -n jupyter

Then ./sage -t should work from the directory SageMath. As a bonus, you'll get the latest version of Sage (9.4), while the Ubuntu package is only 9.0.

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No.2 Revision

The Ubuntu package sagemath does not offer all the functionalities for advanced use of SageMath, like testing or installing additional packages. I would therefore suggest that you install Sage SageMath in your home directory by downloading the binary image for Ubuntu 20.04 from https://www.sagemath.org/download-linux.html. Simply do

sudo apt-get install python-is-python3
tar jxvf sage-9.4-Ubuntu_20.04-x86_64.tar.bz2
cd SageMath
./sage -n jupyter

Then ./sage -t should work from the directory SageMath. As a bonus, you'll get the latest version of Sage (9.4), while the Ubuntu package is only 9.0.