I downloaded and installed sage from sage-9.3-Ubuntu_20.04-x86_64 on a Ubuntu 20.04 installation. However I believe this version is broken. A simple example is the basic arrow in the documentation.
The binary for Ubuntu 18.04 has the same problem.
After building from source on a Raspberry Pi4, 9.3 works without any problems. I know I can build from source on my PC, but this can be off-putting for new and inexperienced users.