One of the last lines in the crash report:

   ImportError: libgfortran.so.3: cannot open shared object file: No such file 
or directory

It looks like you need to install gfortran.

-- 
John




On Sunday, July 23, 2017 at 2:54:43 AM UTC-7, Santosh Pattanayak wrote:
>
>  Hello,
>          I tried to install sage: 7.5.1 on my kubuntu 6.4 laptop. When I 
> tried to run the command ./sage it gave me the following error. The crash 
> report is also attached herewith for your reference.
>
> ==============================
> ======================
>
> ops, 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/santosh/.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 sage-s...@googlegroups.com <javascript:>
> 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' sage-s...@googlegroups.com <javascript:> < 
> /home/santosh/.sage/ipython-5.0.0/Sage_crash_report.txt
>
> To ensure accurate tracking of this issue, please file a report about it 
> at:http://trac.sagemath.org
>
> Hit <Enter> to quit (your terminal may close):
> ==============================================
>
> Thanks
>
>

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