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I'll bet you have Anaconda installed. Previous answers have indicated that removing a single line from a configuration file will allow Sage to run with Anaconda installed:

https://ask.sagemath.org/question/35132/how-do-i-solve-this-installation-problem/
https://ask.sagemath.org/question/34416/importerror-no-module-named-sage/

Anaconda adds itself to the $PATH variable through .bashrc during installation. Removing any references to Anaconda in your $PATH should allow Sage to run.

The other alternative which is known to work is to uninstall Anaconda completely.