创建新的虚拟环境，报错如下：
(base) chen@ubuntu:~$ conda create -name R_env3.5 python=3.7
Collecting package metadata (current_repodata.json): done
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): failed
# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<
Traceback (most recent call last):
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 375, in _load
raw_repodata_str = fetch_repodata_remote_request(
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 815, in fetch_repodata_remote_request
raise Response304ContentUnchanged()
conda.core.subdir_data.Response304ContentUnchanged
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/exceptions.py", line 1079, in __call__
return func(*args, **kwargs)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/cli/main.py", line 84, in _main
exit_code = do_call(args, p)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/cli/conda_argparse.py", line 83, in do_call
return getattr(module, func_name)(args, parser)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/cli/main_create.py", line 41, in execute
install(args, parser, 'create')
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/cli/install.py", line 261, in install
unlink_link_transaction = solver.solve_for_transaction(
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/solve.py", line 114, in solve_for_transaction
unlink_precs, link_precs = self.solve_for_diff(update_modifier, deps_modifier,
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/solve.py", line 157, in solve_for_diff
final_precs = self.solve_final_state(update_modifier, deps_modifier, prune, ignore_pinned,
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/solve.py", line 262, in solve_final_state
ssc = self._collect_all_metadata(ssc)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/common/io.py", line 88, in decorated
return f(*args, **kwds)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/solve.py", line 425, in _collect_all_metadata
index, r = self._prepare(prepared_specs)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/solve.py", line 1020, in _prepare
reduced_index = get_reduced_index(self.prefix, self.channels,
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/index.py", line 288, in get_reduced_index
new_records = SubdirData.query_all(spec, channels=channels, subdirs=subdirs,
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 140, in query_all
result = tuple(concat(executor.map(subdir_query, channel_urls)))
File "/home/chen/miniconda3/lib/python3.8/concurrent/futures/_base.py", line 611, in result_iterator
yield fs.pop().result()
File "/home/chen/miniconda3/lib/python3.8/concurrent/futures/_base.py", line 432, in result
return self.__get_result()
File "/home/chen/miniconda3/lib/python3.8/concurrent/futures/_base.py", line 388, in __get_result
raise self._exception
File "/home/chen/miniconda3/lib/python3.8/concurrent/futures/thread.py", line 57, in run
result = self.fn(*self.args, **self.kwargs)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 132, in <lambda>
subdir_query = lambda url: tuple(SubdirData(Channel(url), repodata_fn=repodata_fn).query(
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 145, in query
self.load()
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 210, in load
_internal_state = self._load()
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 393, in _load
_internal_state = self._read_local_repdata(mod_etag_headers.get('_etag'),
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 442, in _read_local_repdata
_internal_state = self._process_raw_repodata_str(raw_repodata_str)
File "/home/chen/miniconda3/lib/python3.8/site-packages/conda/core/subdir_data.py", line 480, in _process_raw_repodata_str
json_obj = json.loads(raw_repodata_str or '{}')
File "/home/chen/miniconda3/lib/python3.8/json/__init__.py", line 357, in loads
return _default_decoder.decode(s)
File "/home/chen/miniconda3/lib/python3.8/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/home/chen/miniconda3/lib/python3.8/json/decoder.py", line 353, in raw_decode
obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Unterminated string starting at: line 1306937 column 9 (char 38944593)
`$ /home/chen/miniconda3/bin/conda create -name R_env3.5 python=3.7`
environment variables:
CIO_TEST=<not set>
CONDA_DEFAULT_ENV=base
CONDA_EXE=/home/chen/miniconda3/bin/conda
CONDA_PREFIX=/home/chen/miniconda3
CONDA_PROMPT_MODIFIER=(base)
CONDA_PYTHON_EXE=/home/chen/miniconda3/bin/python
CONDA_ROOT=/home/chen/miniconda3
CONDA_SHLVL=1
CURL_CA_BUNDLE=<not set>
PATH=/home/chenyx/miniconda3/bin:/home/chen/bin:/home/chen/.local/bin:/
home/chen/miniconda3/bin:/home/chenyx/miniconda3/condabin:/usr/local
/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/loc
al/games:/snap/bin
REQUESTS_CA_BUNDLE=<not set>
SSL_CERT_FILE=<not set>
active environment : base
active env location : /home/chen/miniconda3
shell level : 1
user config file : /home/chen/.condarc
populated config files : /home/chen/.condarc
conda version : 4.10.3
conda-build version : not installed
python version : 3.8.5.final.0
virtual packages : __cuda=10.2=0
__linux=4.4.0=0
__glibc=2.23=0
__unix=0=0
__archspec=1=x86_64
base environment : /home/chen/miniconda3 (writable)
conda av data dir : /home/chen/miniconda3/etc/conda
conda av metadata url : None
channel URLs : https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/linux-64
https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/noarch
https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/linux-64
https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/noarch
https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/linux-64
https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch
https://conda.anaconda.org/bioconda/linux-64
https://conda.anaconda.org/bioconda/noarch
https://conda.anaconda.org/r/linux-64
https://conda.anaconda.org/r/noarch
https://repo.anaconda.com/pkgs/main/linux-64
https://repo.anaconda.com/pkgs/main/noarch
https://repo.anaconda.com/pkgs/r/linux-64
https://repo.anaconda.com/pkgs/r/noarch
https://conda.anaconda.org/conda-forge/linux-64
https://conda.anaconda.org/conda-forge/noarch
package cache : /home/chenyx/miniconda3/pkgs
/home/chenyx/.conda/pkgs
envs directories : /home/chenyx/miniconda3/envs
/home/chenyx/.conda/envs
platform : linux-64
user-agent : conda/4.10.3 requests/2.24.0 CPython/3.8.5 Linux/4.4.0-116-generic ubuntu/16.04.4 glibc/2.23
UID:GID : 1010:1010
netrc file : None
offline mode : False
An unexpected error has occurred. Conda has prepared the above report.
If submitted, this report will be used by core maintainers to improve
future releases of conda.
Would you like conda to send this report to the core maintainers?
[y/N]:
Timeout reached. No report sent.
解决方法：
明明昨天还好好的，今天就不行了，必然是因为我昨天疯狂加channel导致的。
直接恢复默认源：
conda config --remove-key channels
结果再一次报错：
(base) chen@ubuntu:~$ conda create -name R_env3.5 python=3.7
Collecting package metadata (current_repodata.json): done
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed
PackagesNotFoundError: The following packages are not available from current channels:
- r_env3.5
Current channels:
- https://repo.anaconda.com/pkgs/main/linux-64
- https://repo.anaconda.com/pkgs/main/noarch
- https://repo.anaconda.com/pkgs/r/linux-64
- https://repo.anaconda.com/pkgs/r/noarch
To search for alternate channels that may provide the conda package you're
looking for, navigate to
https://anaconda.org
and use the search bar at the top of the page.
结果发现是自己命令输入错误，改正即可：
conda create -n R_env3 python=3.7