conda install python=3.6 UnsatisfiableError

You have enum34 installed, which requires 2.6-3.5. Installing Python 3.6 is thus not possible without either updating enum34 to see if newer versions support 3.6, removing enum34, or installing Python 3.6 in a new environment.

I had the same error but a bit different:

UnsatisfiableError: The following specifications were found to be in conflict:
  - argcomplete -> python 3.5*
  - python ==3.6
Use "conda info <package>" to see the dependencies for each package.

You can try removing offending packages like this:

conda remove argcomplete conda-manager

Sometimes this will keep showing new offending packages. In that case, I would just remove Anaconda installation from the path, delete folder and re-install.

However, ultimately I just found that Python 3.6 is not worth the trouble yet due to incompatibility with TensorFlow, OpenCV, VS2015 etc. So I ended up making Python 3.5 as default by doing this in Anaconda:

conda install python=3.5

This command will overwrite your Python version in conda with 3.5. Doing this fixed most of the errors I was facing.