On Sunday, March 11, 2018 at 6:25:15 PM UTC+10, Jeroen Demeyer wrote:
> What are the permissions of the directory where you installed Sage and 
> what is your umask? 
> The file permissions on my desktop (Ubuntu 16.04 LTS) are the same as my 
laptop (Ubuntu 17.10). However, there is a umask difference

desktop: 0002
laptop: 0022

When I set the umask of my laptop to 0002, then I can run doctests. 
However, 0002 makes the created files/directories *more* permissive by 
making it group writable. So this seems like a bug in Sage to me; at least 
it contradicts the error message...


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