我下载了最新的 anaconda，当我想更新所有内容时，它会删除所有软件包。有人知道发生了什么吗？
C:\WINDOWS\system32>conda update --all
Collecting package metadata (current_repodata.json): done
Solving environment: done
## Package Plan ##
environment location: C:\Users\marek\Anaconda3
The following packages will be REMOVED:
_anaconda_depends-2019.03-py37_0
alabaster-0.7.12-py37_0
anaconda-custom-py37_1
anaconda-project-0.8.3-py_0
astroid-2.2.5-py37_0
astropy-3.2.1-py37he774522_0
atomicwrites-1.3.0-py37_1
babel-2.7.0-py_0
backports.os-0.1.1-py37_0
backports.shutil_get_terminal_size-1.0.0-py37_2
bitarray-0.9.3-py37he774522_0
bkcharts-0.2-py37_0
blas-1.0-mkl
blosc-1.16.3-h7bd577a_0
bokeh-1.2.0-py37_0
boto-2.49.0-py37_0
bottleneck-1.2.1-py37h452e1ab_1
cloudpickle-1.2.1-py_0
comtypes-1.1.7-py37_0
console_shortcut-0.1.1-3
contextlib2-0.5.5-py37_0
curl-7.64.1-h2a8f88b_0
cycler-0.10.0-py37_0
cython-0.29.11-py37ha925a31_0
cytoolz-0.9.0.1-py37hfa6e2cd_1
dask-2.0.0-py_0
dask-core-2.0.0-py_0
distributed-2.0.1-py_0
docutils-0.14-py37_0
et_xmlfile-1.0.1-py37_0
fastcache-1.1.0-py37he774522_0
flask-1.0.3-py37_0
get_terminal_size-1.0.0-h38e98db_0
gevent-1.4.0-py37he774522_0
greenlet-0.4.15-py37hfa6e2cd_0
h5py-2.9.0-py37h5e291fa_0
hdf5-1.10.4-h7ebc959_0
heapdict-1.0.0-py37_2
html5lib-1.0.1-py37_0
icc_rt-2019.0.0-h0cc432a_1
imageio-2.5.0-py37_0
imagesize-1.1.0-py37_0
importlib_metadata-0.17-py37_1
intel-openmp-2019.4-245
isort-4.3.21-py37_0
itsdangerous-1.1.0-py37_0
jdcal-1.4.1-py_0
joblib-0.13.2-py37_0
jupyter-1.0.0-py37_7
jupyter_console-6.0.0-py37_0
keyring-18.0.0-py37_0
kiwisolver-1.1.0-py37ha925a31_0
krb5-1.16.1-hc04afaa_7
lazy-object-proxy-1.4.1-py37he774522_0
libcurl-7.64.1-h2a8f88b_0
libssh2-1.8.2-h7a1dbc1_0
libxslt-1.1.33-h579f668_0
llvmlite-0.29.0-py37ha925a31_0
locket-0.2.0-py37_1
lxml-4.3.4-py37h1350720_0
matplotlib-3.1.0-py37hc8f65d3_0
mccabe-0.6.1-py37_1
mkl-2019.4-245
mkl-service-2.0.2-py37he774522_0
mkl_fft-1.0.12-py37h14836fe_0
mkl_random-1.0.2-py37h343c172_0
mock-3.0.5-py37_0
more-itertools-7.0.0-py37_0
mpmath-1.1.0-py37_0
msgpack-python-0.6.1-py37h74a9793_1
multipledispatch-0.6.0-py37_0
networkx-2.3-py_0
nltk-3.4.3-py37_0
nose-1.3.7-py37_2
numba-0.44.1-py37hf9181ef_0
numexpr-2.6.9-py37hdce8814_0
numpy-1.16.4-py37h19fb1c0_0
numpy-base-1.16.4-py37hc3f5095_0
numpydoc-0.9.1-py_0
openpyxl-2.6.2-py_0
packaging-19.0-py37_0
pandas-0.24.2-py37ha925a31_0
partd-1.0.0-py_0
path.py-12.0.1-py_0
pathlib2-2.3.4-py37_0
patsy-0.5.1-py37_0
pep8-1.7.1-py37_0
pluggy-0.12.0-py_0
ply-3.11-py37_0
powershell_shortcut-0.0.1-2
py-1.8.0-py37_0
pycodestyle-2.5.0-py37_0
pycrypto-2.6.1-py37hfa6e2cd_9
pycurl-7.43.0.3-py37h7a1dbc1_0
pyflakes-2.1.1-py37_0
pylint-2.3.1-py37_0
pyodbc-4.0.26-py37ha925a31_0
pyparsing-2.4.0-py_0
pyreadline-2.1-py37_1
pytables-3.5.2-py37h1da0976_1
pytest-5.0.0-py37_0
pytest-arraydiff-0.3-py37h39e3cac_0
pytest-astropy-0.5.0-py37_0
pytest-doctestplus-0.3.0-py37_0
pytest-openfiles-0.3.2-py37_0
pytest-remotedata-0.3.1-py37_0
pywavelets-1.0.3-py37h8c2d366_1
qtawesome-0.5.7-py37_1
qtconsole-4.5.1-py_0
rope-0.14.0-py_0
scikit-image-0.15.0-py37ha925a31_0
scikit-learn-0.21.2-py37h6288b17_0
scipy-1.2.1-py37h29ff71c_0
seaborn-0.9.0-py37_0
simplegeneric-0.8.1-py37_2
singledispatch-3.4.0.3-py37_0
snappy-1.1.7-h777316e_3
snowballstemmer-1.9.0-py_0
sortedcollections-1.1.2-py37_0
sortedcontainers-2.1.0-py37_0
sphinx-2.1.2-py_0
sphinxcontrib-1.0-py37_1
sphinxcontrib-applehelp-1.0.1-py_0
sphinxcontrib-devhelp-1.0.1-py_0
sphinxcontrib-htmlhelp-1.0.2-py_0
sphinxcontrib-jsmath-1.0.1-py_0
sphinxcontrib-qthelp-1.0.2-py_0
sphinxcontrib-serializinghtml-1.1.3-py_0
sphinxcontrib-websupport-1.1.2-py_0
spyder-3.3.5-py37_0
spyder-kernels-0.5.0-py37_0
sqlalchemy-1.3.5-py37he774522_0
statsmodels-0.10.0-py37h8c2d366_0
sympy-1.4-py37_0
tblib-1.4.0-py_0
toolz-0.9.0-py37_0
unicodecsv-0.14.1-py37_0
werkzeug-0.15.4-py_0
win_unicode_console-0.5-py37_0
wrapt-1.11.2-py37he774522_0
xlrd-1.2.0-py37_0
xlsxwriter-1.1.8-py_0
xlwings-0.15.8-py37_0
xlwt-1.3.0-py37_0
zict-1.0.0-py_0
zipp-0.5.1-py_0