The monodevelop package has been removed from Debian, as there were not enough maintainers to handle its large number of dependencies (the debian-cli list has received nothing but spam for nearly 2 years): https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=893860

It remains available from upstream.

The crash is probably this bug, which has a possible workaround (though I haven't tried it myself):
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897576

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