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to sage-support, sage-packaging
I presume this is Sage installed as a standard Ubuntu 18.04 package, right?
What version of Sage is this?
https://packages.ubuntu.com/bionic/sagemath says it's 8.1
This is very old, no wonder it's broken.
The current stable Sage version is 8.9.
Hopefully people at sage-packaging (at cc:) could tell you a better
way to get a binary installation of Sage on Ubuntu 18.04 (or just
build it from source...)