问题描述：

在linux中使用conda create命令新建环境报错如下：

(base) [@localhost SPOT-1D-LM]$ conda create -n spot_1d_lm python=3.7
Collecting package metadata (current_repodata.json): failed

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "/home/sunxiaohan/anaconda3/lib/python3.8/site-packages/conda/exceptions.py", line 1080, in __call__
        return func(*args, **kwargs)
      File "/home/sunxiaohan/anaconda3/lib/python3.8/site-packages/conda/cli/main.py", line 84, in _main
        exit_code = do_call(args, p)
      File "/home/sunxiaohan/anaconda3/lib/python3.8/site-packages/conda/cli/conda_argparse.py", line 83, in do_call
        return getattr(module, func_name)(args, parser)
      File "/home/sunxiaohan/anaconda3/lib/python3.8/site-packages/conda/cli/main_create.py", line 41, in execute
        install(args, parser, 'create')
      File "/home/sunxiaohan/anaconda3/lib/python3.8/site-packages/conda/cli/install.py", line 259, in install
        unlink_link_transaction = solver.solve_for_transaction(
      File "/home/sunxiaohan/anaconda3/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/sunxiaohan/anaconda3/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/sunxiaohan/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 262, in solve_final_state
        ssc = self._collect_all_metadata(ssc)