(This was specifically seen with the Docker image, which doesn't already have a Python installed; doing `apt-get install python3.4 python3-pip` results in python3.5 being installed, with no error.)
(This was specifically seen with the Docker image, which doesn't already have a Python installed; doing `apt-get install python3.4 python3-pip` results in python3.5 being installed, with no error.)