Dear Oscar,
You should tell precisely what is your installation of Sage that
is broken. Looking at the crash report, I assume that you use
Sage from the system. In this situation, you would better address
your question to some Debian help forum or mailing list.
For the bug you encountered, it has already been reported and
apparently fixed
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=932367
Good luck
Vincent