PackageNotInstalledError: Package is not installed in prefix

Question

conda update conda >> successful

conda update anaconda >> gives me error saying package is not installed in prefix.

I have single installation of Python distribution on my system. How do I solve this issue?

(base) C:Usersasukumari>conda info

 active environment : base
active env location : C:UsersasukumariAppDataLocalContinuumanaconda3
        shell level : 1
   user config file : C:Usersasukumari.condarc  populated config files : C:Usersasukumari.condarc
      conda version : 4.5.9
conda-build version : 3.4.1
     python version : 3.6.4.final.0
   base environment : C:UsersasukumariAppDataLocalContinuumanaconda3  (writable)
       channel URLs : https://repo.anaconda.com/pkgs/main/win-64
                      https://repo.anaconda.com/pkgs/main/noarch
                      https://repo.anaconda.com/pkgs/free/win-64
                      https://repo.anaconda.com/pkgs/free/noarch
                      https://repo.anaconda.com/pkgs/r/win-64
                      https://repo.anaconda.com/pkgs/r/noarch
                      https://repo.anaconda.com/pkgs/pro/win-64
                      https://repo.anaconda.com/pkgs/pro/noarch
                      https://repo.anaconda.com/pkgs/msys2/win-64
                      https://repo.anaconda.com/pkgs/msys2/noarch
      package cache : C:UsersasukumariAppDataLocalContinuumanaconda3pkgs
                      C:UsersasukumariAppDataLocalcondacondapkgs
   envs directories : C:UsersasukumariAppDataLocalContinuumanaconda3envs
                      C:UsersasukumariAppDataLocalcondacondaenvs
                      C:Usersasukumari.condaenvs
           platform : win-64
         user-agent : conda/4.5.9 requests/2.18.4 CPython/3.6.4 Windows/10 Windows/10.0.16299
      administrator : False
         netrc file : None
       offline mode : False

Asked By: Rene Duchamp

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Source

Answer 1

to solve the problem after message “PackageNotInstalledError: Package is not installed in prefix” package name: anaconda:

    conda update --all
    ...
    Proceed ([y]/n)? y

regards !

Answered By: Lionel G

Answer 2

Usually this error, "PackageNotInstalledError: Package is not installed in prefix." is because your custom environment doesn’t have the conda infrastructure. Instead, it is in your base only. To update the base environment:

conda update --name base conda

To see what version you have installed:

conda list --name base conda

example output of list;

# packages in environment at /Users/me/miniconda2:
#
# Name                    Version                   Build  Channel
conda                     4.6.14                   py27_0  
conda-env                 2.6.0                h36134e3_0

Answered By: AnneTheAgile

Answer 3

This works for me:

source active <your python env>

Answered By: Yao Yuan

Answer 4

I was getting the following error when trying to update boto3 in my conda environment:

PackageNotInstalledError: Package is not installed in prefix.
prefix: /usr/local/anaconda3/envs/myfoldername

package name: boto3

This was after having already just done: conda install anaconda, conda update -n root conda and conda update --all

However, I did finally succeed in updating boto3, by specifying the version number as follows:

conda install boto3=1.12

Answered By: stuckinmaflo

Answer 5

I met the same problem in my window1 10.
pls change the env to base, because the package “conda” only can be updated in base.
regards!

Answered By: XinYang

Answer 6

I got this error when I tried to update while my conda environment was activated. The solution was to first deactivate:

conda deactivate

before trying to update:

conda update conda

conda update anaconda

Answered By: 5Ke

Answer 7

When a package is installed via pip in a conda env, and updated via conda, it results in the same error message shown. In this case, use

pip install package_name –upgrade

This solved my problem.

Answered By: ewayzhan

Answer 8

This worked for me:

conda update -n base -c defaults conda

Answered By: daguz_

Answer 9

I received this error since anaconda was not available in my default channels. I fixed this by forcing the channel to be anaconda as follows:

conda install -c anaconda anaconda

Answered By: Dan Boschen

Answer 10

I don’t know why but this removed the issue when I put it in my .bashrc file:

export PATH="$HOME/miniconda/bin:$PATH"
source ~/miniconda/bin/activate
conda activate metalearning_gpu

obvious miniconda was int he right place, change that to ur right path to conda stuff.

Answered By: Charlie Parker

PackageNotInstalledError: Package is not installed in prefix

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