PackageNotInstalledError: Package is not installed in prefix

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 : 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 

8 Answers

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 

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

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

regards !

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

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

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!

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.

This worked for me:

conda update -n base -c defaults conda 

This works for me:

source active <your python env>