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:\Users\asukumari>conda info

 active environment : base
active env location : C:\Users\asukumari\AppData\Local\Continuum\anaconda3
        shell level : 1
   user config file : C:\Users\asukumari\.condarc  populated config files : C:\Users\asukumari\.condarc
      conda version : 4.5.9
conda-build version : 3.4.1
     python version : 3.6.4.final.0
   base environment : C:\Users\asukumari\AppData\Local\Continuum\anaconda3  (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:\Users\asukumari\AppData\Local\Continuum\anaconda3\pkgs
                      C:\Users\asukumari\AppData\Local\conda\conda\pkgs
   envs directories : C:\Users\asukumari\AppData\Local\Continuum\anaconda3\envs
                      C:\Users\asukumari\AppData\Local\conda\conda\envs
                      C:\Users\asukumari\.conda\envs
           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

conda update --prefix C:\Users\asukumari\AppData\Local\Continuum\anaconda3 — jalazbe, Aug 14 '18 at 10:46
I installed both Anaconda2 and 3 and now I see conda_console option only under Anaconda2. Why? Is it just one console for both Anaconda2 and 3 — Rene Duchamp, Aug 14 '18 at 15:14
@jalazbe That dint solve it either. I am unable to figure out what to do. — Rene Duchamp, Aug 24 '18 at 13:54

score 65 · Accepted Answer · edited May 26 '20 at 07:36

65

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

edited May 26 '20 at 07:36

yatu

80,714
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answered Jun 25 '19 at 16:49

AnneTheAgile

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3

After this I get: PackageNotInstalledError: Package is not installed in prefix. – user1953366 Jun 28 '19 at 21:21
5

If you have an activated conda environment, deactivate it `conda deactivate` and then `conda update conda` – Vishnudev Oct 19 '20 at 12:21
doesn't seem to work. How do I re-install all of conda? – Charlie Parker Dec 09 '21 at 19:27

score 18 · Answer 2 · answered Dec 05 '18 at 16:47

18

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 Dec 05 '18 at 16:47

Lionel G

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That will update every package in your current env. That seems unlikely to be the goal. – AnneTheAgile Jun 25 '19 at 16:48
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Thank you. It worked. I had created and env and I got this error resolved with the command conda update --all. Cheers – emeralddove Aug 17 '19 at 12:57
doesn't seem to work. How do I re-install all of conda? – Charlie Parker Dec 09 '21 at 19:27

score 6 · Answer 3 · answered Mar 26 '20 at 11:18

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 Mar 26 '20 at 11:18

5Ke

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score 4 · Answer 4 · answered Feb 20 '20 at 17:24

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

had the same problem after "pip install emcee" - solved by "conda install emcee=3.0.2" .. — Trond.H.H, Jul 04 '20 at 00:43

score 3 · Answer 5 · answered Feb 24 '20 at 07:51

3

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 Feb 24 '20 at 07:51

XinYang

31
1

yup, this is the real solution to the problem. I just did this and it worked, without any extra finagling. – autonopy Nov 11 '21 at 16:42

score 2 · Answer 6 · answered Jan 21 '22 at 18:36

2

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 Jan 21 '22 at 18:36

ewayzhan

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score 0 · Answer 7 · answered Feb 11 '22 at 19:06

0

This worked for me:

conda update -n base -c defaults conda

answered Feb 11 '22 at 19:06

daguz_

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score -5 · Answer 8 · edited Dec 02 '19 at 10:28

-5

This works for me:

source active <your python env>

edited Dec 02 '19 at 10:28

showdev

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answered Dec 02 '19 at 06:46

Yao Yuan

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PackageNotInstalledError: Package is not installed in prefix

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