The .evergreen/integration-tests.sh helper script refers to /opt/python/2.7/bin/python, presumably to be used by systems where the system-provided Python interpreter is too old. With Ubuntu 14.04 Evergreen hosts, the case is that the system-provided Python is too old, but the /opt/python/2.7/bin/python interpreter is also not present. This results in many Evergreen tasks being a system-failed state. The correct course of action seem to be to be update the .evergreen/integration-tests.sh helper script so that Ubuntu 14.04 hosts are able to find the appropriate Python interpreter that works for our use cases.