（1）错误信息

(base) nki@nku08-PowerEdge-R740:~$ conda update -n base -c defaults conda
Collecting package metadata (current_repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: /home/nki/anaconda3

  added / updated specs:
    - conda


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    backports.functools_lru_cache-1.6.1|     pyhd3eb1b0_0          12 KB  defaults
    conda-4.9.2                |   py38h06a4308_0         2.9 MB  defaults
    conda-package-handling-1.7.2|   py38h03888b9_0         886 KB  defaults
    ------------------------------------------------------------
                                           Total:         3.7 MB

The following packages will be UPDATED:

  conda                                        4.8.3-py38_0 --> 4.9.2-py38h06a4308_0
  conda-package-han~                   1.6.1-py38h7b6447c_0 --> 1.7.2-py38h03888b9_0

The following packages will be DOWNGRADED:

  backports.functoo~                             1.6.1-py_0 --> 1.6.1-pyhd3eb1b0_0


Proceed ([y]/n)? y


Downloading and Extracting Packages
conda-package-handli | 886 KB    | ######################################################################################################################################################################### | 100% 
conda-4.9.2          | 2.9 MB    | ######################################################################################################################################################################### | 100% 
backports.functools_ | 12 KB     | ######################################################################################################################################################################### | 100% 
Preparing transaction: done
Verifying transaction: failed

EnvironmentNotWritableError: The current user does not have write permissions to the target environment.
  environment location: /home/nki/anaconda3
  uid: 1001
  gid: 1001


(base) nki@nku08-PowerEdge-R740:~$ conda info

     active environment : base
    active env location : /home/nki/anaconda3
            shell level : 1
       user config file : /home/nki/.condarc
 populated config files : /home/nki/.condarc
          conda version : 4.8.3
    conda-build version : 3.18.11
         python version : 3.8.3.final.0
       virtual packages : __cuda=11.0
                          __glibc=2.27
       base environment : /home/nki/anaconda3  (read only)
           channel URLs : http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/linux-64
                          http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch
                          http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/linux-64
                          http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/noarch
                          http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/linux-64
                          http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/noarch
                          https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
          package cache : /home/nki/anaconda3/pkgs
                          /home/nki/.conda/pkgs
       envs directories : /home/nki/.conda/envs
                          /home/nki/anaconda3/envs
               platform : linux-64
             user-agent : conda/4.8.3 requests/2.24.0 CPython/3.8.3 Linux/5.4.0-52-generic ubuntu/18.04.5 glibc/2.27
                UID:GID : 1001:1001
             netrc file : None
           offline mode : False

(base) nki@nku08-PowerEdge-R740:~$

（2）错误原因

权限问题

（3）解决方法

sudo chmod -R 777 anaconda3/

（4）再次更新conda

(base) nki@nku08-PowerEdge-R740:~$ conda update --all
Collecting package metadata (current_repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: /home/nki/anaconda3


The following NEW packages will be INSTALLED:

  python_abi         anaconda/cloud/conda-forge/linux-64::python_abi-3.8-1_cp38

The following packages will be UPDATED:

  backports.weakref  pkgs/main/noarch::backports.weakref-1~ --> anaconda/cloud/conda-forge/linux-64::backports.weakref-1.0.post1-py38h32f6830_1002
  conda                       pkgs/main::conda-4.8.3-py38_0 --> anaconda/cloud/conda-forge::conda-4.9.2-py38h578d9bd_0
  conda-build         pkgs/main::conda-build-3.18.11-py38_0 --> anaconda/cloud/conda-forge::conda-build-3.20.5-py38h924ce5b_0
  conda-package-han~ pkgs/main::conda-package-handling-1.6~ --> anaconda/cloud/conda-forge::conda-package-handling-1.7.2-py38h8df0ef7_0

The following packages will be SUPERSEDED by a higher-priority channel:

  _libgcc_mutex                                   pkgs/main --> anaconda/cloud/conda-forge
  blas                                            pkgs/main --> anaconda/pkgs/free
  conda-env                    pkgs/main::conda-env-2.6.0-1 --> anaconda/pkgs/free::conda-env-2.6.0-0
  defusedxml                                      pkgs/main --> anaconda/cloud/conda-forge
  heapdict                                        pkgs/main --> anaconda/cloud/conda-forge
  partd                                           pkgs/main --> anaconda/cloud/conda-forge
  tblib                                           pkgs/main --> anaconda/cloud/conda-forge


Proceed ([y]/n)? y

Preparing transaction: done
Verifying transaction: done
Executing transaction: done
(base) nki@nku08-PowerEdge-R740:~$