Note that cantor-backend-sage doesn't work with the SageMath package right now due to #972346. Although caused by a change in Sage, I think it should be quite easy to work around in Cantor. Indeed, replacing /usr/share/cantor/sagebackend/cantor-execsage with just #!/usr/bin/sage --sh exec sage-ipython -i --simple-prompt seems to make it work, although Sage's SyntaxWarnings make the output a little wonky at first (as it does on the CLI). I'll make a merge request to implement this.
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