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What causes sage to crash as it starts?

Installed sage 7.6 on Ubuntu 16.04 LTS to work with a colleague who is also on 7.X release (they are on Fedora). It all seemed to go OK but consistently get a crash message as soon as it starts. A crash report text file is created - can supply that for someone to look at.

Here is the terminal output:

┌────────────────────────────────────────────────────────────────────┐ │ SageMath version 7.6, Release Date: 2017-03-25 │ │ Type "notebook()" for the browser-based notebook interface. │ │ Type "help()" for help. │ └────────────────────────────────────────────────────────────────────┘

Oops, Sage crashed. We do our best to make it stable, but...

A crash report was automatically generated with the following information: - A verbatim copy of the crash traceback. - A copy of your input history during this session. - Data on your current Sage configuration.

It was left in the file named: '/home/davelautzenheiser/.sage/ipython-5.0.0/Sage_crash_report.txt' If you can email this file to the developers, the information in it will help them in understanding and correcting the problem.

You can mail it to: sage-support at with the subject 'Sage Crash Report'.

If you want to do it now, the following command will work (under Unix): mail -s 'Sage Crash Report' < /home/davelautzenheiser/.sage/ipython-5.0.0/Sage_crash_report.txt