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It seems your system is using python3 by default, which is unusual. What do the following commands answer:

 /usr/bin/env python --version

If it answers Python 3.x, then a possibility could be to use a virtual environment so that, locally, the default version is 2.7 as follows:

• install the virtualenv package

• create the virtual environment:

  virtualenv -p /usr/bin/python2.7 venv2.7
  

• activate the virtualenv (don't forget the leading dot)

  . venv2.7/bin/activate
  

• run your Sage commands

• deactivate the virtualenv:

  deactivate