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As some other answers pointed out, the problem is that the first time that sage is called, the script relocate-once.py is executed. Since in that file, the shebang line reads /usr/bin/env python, the system calls the default python interpreter. The simplest solution is to have python 2.7 installed and change that line to /usr/bin/env python2.7 or directly the path of a python 2.7 interpreter.