title: Problem with creating an environment from .yml file, error "CondaEnvException: Pip failed" raised
body: <p>I am trying to create an environment based on a .yml file, the name of the file is <code>env.yml</code> . I run the following snippet on terminal:</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>conda env create -f env.yml</code></pre>
  </div>
  </div>
  </p>
  <p>Then anaconda starts installing all packages outlined in the .yml file, until it gets to packages installed with pip. It raises the following error:</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>Ran pip subprocess with arguments:
  ['/Users/danielribeiro/opt/anaconda3/envs/lz_env/bin/python', '-m', 'pip', 'install', '-U', '-r', '/Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt']
  Pip subprocess output:
  Collecting backports-lzma==0.0.13 (from -r /Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt (line 1))
  
  Pip subprocess error:
    Could not find a version that satisfies the requirement backports-lzma==0.0.13 (from -r /Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt (line 1)) (from versions: )
  No matching distribution found for backports-lzma==0.0.13 (from -r /Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt (line 1))
  
  
  CondaEnvException: Pip failed</code></pre>
  </div>
  </div>
  </p>
  <p>I am not sure why the package backport-lzma==0.0.13 is not installing. I also try installing it manually with</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>conda activate lz_env
  pip install backports-lzma==0.0.13
  
  
  Collecting backports-lzma==0.0.13
    Could not find a version that satisfies the requirement backports-lzma==0.0.13 (from versions: )
  No matching distribution found for backports-lzma==0.0.13</code></pre>
  </div>
  </div>
  </p>
  <p>How do I make sure I can create the environment 'lz_env' based on the .yml file I have with all the packages contained in the file?</p>
  <p>the .yml file is the following:</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>name: lz_env
  channels:
    - conda-forge
    - defaults
  dependencies:
    - _ipyw_jlab_nb_ext_conf=0.1.0=py27_0
    - alabaster=0.7.12=py27_0
    - anaconda-client=1.7.2=py27_0
    - anaconda-navigator=1.9.6=py27_0
    - anaconda-project=0.8.2=py27_0
    - appnope=0.1.0=py27hb466136_0
    - appscript=1.0.1=py27h1de35cc_1
    - asn1crypto=0.24.0=py27_0
    - astroid=1.6.5=py27_0
    - astropy=2.0.9=py27h1d22016_0
    - atomicwrites=1.2.1=py27_0
    - attrs=18.2.0=py27h28b3542_0
    - babel=2.6.0=py27_0
    - backports=1.0=py27_1
    - backports.functools_lru_cache=1.5=py27_1
    - backports.os=0.1.1=py27_0
    - backports.shutil_get_terminal_size=1.0.0=py27_2
    - backports_abc=0.5=py27h6972548_0
    - beautifulsoup4=4.6.3=py27_0
    - bitarray=0.8.3=py27h1de35cc_0
    - bkcharts=0.2=py27haafc882_0
    - blas=1.0=mkl
    - blaze=0.11.3=py27_0
    - bleach=3.0.2=py27_0
    - blosc=1.14.4=hd9629dc_0
    - bokeh=1.0.2=py27_0
    - boto=2.49.0=py27_0
    - bottleneck=1.2.1=py27h1d22016_1
    - bzip2=1.0.6=h1de35cc_5
    - ca-certificates=2019.11.28=hecc5488_0
    - cairo=1.16.0=h0ab9d94_1001
    - cdecimal=2.3=py27h1de35cc_3
    - certifi=2019.11.28=py27_0
    - cffi=1.11.5=py27h6174b99_1
    - chardet=3.0.4=py27_1
    - click=7.0=py27_0
    - cloudpickle=0.6.1=py27_0
    - clyent=1.2.2=py27_1
    - colorama=0.4.1=py27_0
    - conda=4.8.0=py27_1
    - conda-env=2.6.0=1
    - conda-package-handling=1.6.0=py27h0b31af3_1
    - conda-verify=3.1.1=py27_0
    - configparser=3.5.0=py27hc7edf1b_0
    - contextlib2=0.5.5=py27h9cb85f4_0
    - cryptography=2.4.2=py27ha12b0ac_0
    - curl=7.63.0=ha441bb4_1000
    - cycler=0.10.0=py27hfc73c78_0
    - cython=0.29.2=py27h0a44026_0
    - cytoolz=0.9.0.1=py27h1de35cc_1
    - dask=1.0.0=py27_0
    - dask-core=1.0.0=py27_0
    - datashape=0.5.4=py27_1
    - dbus=1.13.2=h760590f_1
    - decorator=4.3.0=py27_0
    - defusedxml=0.5.0=py27_1
    - distributed=1.25.1=py27_0
    - docutils=0.14=py27h0befae3_0
    - entrypoints=0.2.3=py27_2
    - enum34=1.1.6=py27_1
    - et_xmlfile=1.0.1=py27hc42f929_0
    - expat=2.2.6=h0a44026_0
    - fastcache=1.0.2=py27h1de35cc_2
    - filelock=3.0.10=py27_0
    - flask=1.0.2=py27_1
    - flask-cors=3.0.7=py27_0
    - fontconfig=2.13.1=h1027ab8_1000
    - freetype=2.9.1=hb4e5f40_0
    - funcsigs=1.0.2=py27hb9f6266_0
    - functools32=3.2.3.2=py27_1
    - future=0.17.1=py27_0
    - futures=3.2.0=py27_0
    - get_terminal_size=1.0.0=h7520d66_0
    - gettext=0.19.8.1=h15daf44_3
    - gevent=1.3.7=py27h1de35cc_1
    - glib=2.58.3=h9d45998_1002
    - glob2=0.6=py27_1
    - gmp=6.1.2=hb37e062_1
    - gmpy2=2.0.8=py27h6ef4df4_2
    - gobject-introspection=1.56.1=py27h64a7abb_1002
    - greenlet=0.4.15=py27h1de35cc_0
    - grin=1.2.1=py27_4
    - h5py=2.8.0=py27h878fce3_3
    - hdf5=1.10.2=hfa1e0ec_1
    - heapdict=1.0.0=py27_2
    - html5lib=1.0.1=py27_0
    - icu=58.2=h4b95b61_1
    - idna=2.8=py27_0
    - imageio=2.4.1=py27_0
    - imagesize=1.1.0=py27_0
    - importlib_metadata=0.6=py27_0
    - intel-openmp=2019.1=144
    - ipaddress=1.0.22=py27_0
    - ipykernel=4.10.0=py27_0
    - ipython=5.8.0=py27_0
    - ipython_genutils=0.2.0=py27h8b9a179_0
    - ipywidgets=7.4.2=py27_0
    - isort=4.3.4=py27_0
    - itsdangerous=1.1.0=py27_0
    - jbig=2.1=h4d881f8_0
    - jdcal=1.4=py27_0
    - jedi=0.13.2=py27_0
    - jinja2=2.10=py27_0
    - jpeg=9b=he5867d9_2
    - jsonschema=2.6.0=py27hd9b497e_0
    - jupyter=1.0.0=py27_7
    - jupyter_client=5.2.4=py27_0
    - jupyter_console=5.2.0=py27_1
    - jupyter_core=4.4.0=py27_0
    - jupyterlab=0.33.11=py27_0
    - jupyterlab_launcher=0.11.2=py27h28b3542_0
    - keyring=17.0.0=py27_0
    - kiwisolver=1.0.1=py27h0a44026_0
    - krb5=1.16.1=hddcf347_7
    - lazy-object-proxy=1.3.1=py27h1de35cc_2
    - libcurl=7.63.0=h051b688_1000
    - libcxx=4.0.1=hcfea43d_1
    - libcxxabi=4.0.1=hcfea43d_1
    - libedit=3.1.20170329=hb402a30_2
    - libffi=3.2.1=h475c297_4
    - libgfortran=3.0.1=h93005f0_2
    - libiconv=1.15=hdd342a3_7
    - liblief=0.9.0=h2a1bed3_0
    - libpng=1.6.35=ha441bb4_0
    - libsodium=1.0.16=h3efe00b_0
    - libssh2=1.8.0=ha12b0ac_4
    - libtiff=4.0.9=hcb84e12_2
    - libxml2=2.9.8=hab757c2_1
    - libxslt=1.1.32=hb819dd2_0
    - linecache2=1.0.0=py27_0
    - llvmlite=0.26.0=py27h8c7ce04_0
    - locket=0.2.0=py27ha10513d_1
    - lxml=4.2.5=py27hef8c89e_0
    - lz4-c=1.8.1.2=h1de35cc_0
    - lzo=2.10=h362108e_2
    - markupsafe=1.1.0=py27h1de35cc_0
    - matplotlib=2.2.3=py27h54f8f79_0
    - mccabe=0.6.1=py27_1
    - mistune=0.8.4=py27h1de35cc_0
    - mkl=2019.1=144
    - mkl-service=1.1.2=py27hfbe908c_5
    - mkl_fft=1.0.6=py27h27c97d8_0
    - mkl_random=1.0.2=py27h27c97d8_0
    - more-itertools=4.3.0=py27_0
    - mpc=1.1.0=h6ef4df4_1
    - mpfr=4.0.1=h3018a27_3
    - mpmath=1.1.0=py27_0
    - msgpack-python=0.5.6=py27h04f5b5a_1
    - multipledispatch=0.6.0=py27_0
    - navigator-updater=0.2.1=py27_0
    - nbconvert=5.4.0=py27_1
    - nbformat=4.4.0=py27hddc86d0_0
    - ncurses=6.1=h0a44026_1
    - networkx=2.2=py27_1
    - nltk=3.4=py27_1
    - nose=1.3.7=py27_2
    - notebook=5.7.4=py27_0
    - numba=0.41.0=py27h6440ff4_0
    - numexpr=2.6.8=py27h7413580_0
    - numpy=1.15.4=py27hacdab7b_0
    - numpy-base=1.15.4=py27h6575580_0
    - numpydoc=0.8.0=py27_0
    - odo=0.5.1=py27h992a9f7_0
    - olefile=0.46=py27_0
    - openpyxl=2.5.12=py27_0
    - openssl=1.1.1d=h0b31af3_0
    - packaging=18.0=py27_0
    - pandas=0.23.4=py27h6440ff4_0
    - pandoc=1.19.2.1=ha5e8f32_1
    - pandocfilters=1.4.2=py27_1
    - parso=0.3.1=py27_0
    - partd=0.3.9=py27_0
    - path.py=11.5.0=py27_0
    - pathlib2=2.3.3=py27_0
    - patsy=0.5.1=py27_0
    - pcre=8.42=h378b8a2_0
    - pep8=1.7.1=py27_0
    - pexpect=4.6.0=py27_0
    - pickleshare=0.7.5=py27_0
    - pillow=5.3.0=py27hb68e598_0
    - pip=18.1=py27_0
    - pixman=0.38.0=h01d97ff_1003
    - pkginfo=1.4.2=py27_1
    - pluggy=0.8.0=py27_0
    - ply=3.11=py27_0
    - portaudio=19.6.0=h41429eb_1
    - prometheus_client=0.5.0=py27_0
    - prompt_toolkit=1.0.15=py27h4a7b9c2_0
    - psutil=5.4.8=py27h1de35cc_0
    - ptyprocess=0.6.0=py27_0
    - py=1.7.0=py27_0
    - py-lief=0.9.0=py27hd4eaf27_0
    - pyaudio=0.2.11=py27h1de35cc_1
    - pycodestyle=2.4.0=py27_0
    - pycosat=0.6.3=py27h1de35cc_0
    - pycparser=2.19=py27_0
    - pycrypto=2.6.1=py27h1de35cc_9
    - pycurl=7.43.0.2=py27ha12b0ac_0
    - pyflakes=2.0.0=py27_0
    - pygments=2.3.1=py27_0
    - pygobject=3.28.3=py27h21bf938_1002
    - pylint=1.9.2=py27_0
    - pyodbc=4.0.25=py27h0a44026_0
    - pyopenssl=18.0.0=py27_0
    - pyparsing=2.3.0=py27_0
    - pyqt=5.9.2=py27h655552a_2
    - pysocks=1.6.8=py27_0
    - pytables=3.4.4=py27h13cba08_0
    - pytest=4.0.2=py27_0
    - python=2.7.15=h8f8e585_6
    - python-dateutil=2.7.5=py27_0
    - python.app=2=py27_9
    - pytz=2018.7=py27_0
    - pywavelets=1.0.1=py27h1d22016_0
    - pyyaml=3.13=py27h1de35cc_0
    - pyzmq=17.1.2=py27h1de35cc_0
    - qt=5.9.7=h468cd18_1
    - qtawesome=0.5.3=py27_0
    - qtconsole=4.4.3=py27_0
    - qtpy=1.5.2=py27_0
    - readline=7.0=h1de35cc_5
    - requests=2.21.0=py27_0
    - rope=0.11.0=py27_0
    - ruamel_yaml=0.15.46=py27h1de35cc_0
    - scandir=1.9.0=py27h1de35cc_0
    - scikit-image=0.14.1=py27h0a44026_0
    - scikit-learn=0.20.1=py27h27c97d8_0
    - scipy=1.1.0=py27h1410ff5_2
    - seaborn=0.9.0=py27_0
    - send2trash=1.5.0=py27_0
    - setuptools=40.6.3=py27_0
    - simplegeneric=0.8.1=py27_2
    - singledispatch=3.4.0.3=py27he22c18d_0
    - sip=4.19.8=py27h0a44026_0
    - six=1.12.0=py27_0
    - snappy=1.1.7=he62c110_3
    - snowballstemmer=1.2.1=py27h68ac032_0
    - sortedcollections=1.0.1=py27_0
    - sortedcontainers=2.1.0=py27_0
    - sphinx=1.8.2=py27_0
    - sphinxcontrib=1.0=py27_1
    - sphinxcontrib-websupport=1.1.0=py27_1
    - spyder=3.3.2=py27_0
    - spyder-kernels=0.3.0=py27_0
    - sqlalchemy=1.2.15=py27h1de35cc_0
    - sqlite=3.26.0=ha441bb4_0
    - ssl_match_hostname=3.5.0.1=py27_2
    - statsmodels=0.9.0=py27h1d22016_0
    - subprocess32=3.5.3=py27h1de35cc_0
    - sympy=1.3=py27_0
    - tblib=1.3.2=py27ha684fc4_0
    - terminado=0.8.1=py27_1
    - testpath=0.4.2=py27_0
    - tk=8.6.8=ha441bb4_0
    - toolz=0.9.0=py27_0
    - tornado=5.1.1=py27h1de35cc_0
    - tqdm=4.28.1=py27h28b3542_0
    - traceback2=1.4.0=py27_0
    - traitlets=4.3.2=py27hcf08151_0
    - typing=3.6.6=py27_0
    - unicodecsv=0.14.1=py27h170f95c_0
    - unittest2=1.1.0=py27_0
    - unixodbc=2.3.7=h1de35cc_0
    - urllib3=1.24.1=py27_0
    - wcwidth=0.1.7=py27h817c265_0
    - webencodings=0.5.1=py27_1
    - werkzeug=0.14.1=py27_0
    - wheel=0.32.3=py27_0
    - widgetsnbextension=3.4.2=py27_0
    - wrapt=1.10.11=py27h1de35cc_2
    - wurlitzer=1.0.2=py27_0
    - xlrd=1.2.0=py27_0
    - xlsxwriter=1.1.2=py27_0
    - xlwings=0.15.1=py27_0
    - xlwt=1.2.0=py27hbeec4ae_0
    - xz=5.2.4=h1de35cc_4
    - yaml=0.1.7=hc338f04_2
    - zeromq=4.2.5=h0a44026_1
    - zict=0.1.3=py27_0
    - zlib=1.2.11=h1de35cc_3
    - pip:
      - backports-lzma==0.0.13
      - brotli==1.0.7
      - dill==0.3.1.1
      - hickle==3.4.5
      - moviepy==1.0.0
      - pipenv==2018.11.26
      - proglog==0.1.9
      - pycairo==1.18.2
      - runsnakerun==2.0.4
      - squaremap==1.0.4
      - virtualenv==16.6.0
      - virtualenv-clone==0.5.3
      - wxpython==4.0.6
      - zopfli==0.1.6
      - zstd==1.4.0.0</code></pre>
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