Your log says that your Sage installation is in /home/dillon/sage-8.1
I guess you might want to set it as SAGE_ROOT

On Monday, February 19, 2018 at 3:25:04 AM UTC, Dillon Ethier wrote:
> Hello,
> I recently built Sage on my laptop running Ubuntu 17.10 (x86 - 64 bit). It 
> worked perfectly, and successfully ran all of the basic tests (I never ran 
> the long tests). I tried to start it up today and it wouldn't work, because 
> it said it could not find the directory that I had set as SAGE_ROOT (I 
> don't remember exactly what it was set as, I think maybe /usr/bin/sage or 
> something like that), and indeed this directory no longer existed. I tried 
> to rebuild Sage in order to fix the issue, and it hasn't worked since
> Every time I try to start Sage, it crashes immediately. I get this error 
> that seems to be coming from Pari somewhere but the error messages are 
> baffling to me. I've tried rebuilding multiple times and nothing helps. I 
> guess what I'm trying to say is that I KNOW that it's possible for Sage to 
> work on my machine, as I had already done it. I just can't figure out what 
> got broken or how to fix it. Any help would be much appreciated.
> Thanks,
> Dillon Ethier

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