AssertionError while updating conda

Question

I've tried to update conda using the following command :

~$ conda update conda

It outputs the following message:

WARNING conda.base.context:use_only_tar_bz2(632): Conda is constrained to only 
using the old .tar.bz2 file format because you have conda-build installed, 
and it is <3.18.3.  Update or remove conda-build to get smaller downloads 
and faster extractions.
Collecting package metadata (repodata.json): done
Solving environment: - 

The environment is inconsistent, please check the package plan carefully

The following packages are causing the inconsistency:

- defaults/linux-64::cytoolz==0.9.0.1=py37h14c3975_1

- and around 100 more

Preparing transaction: done

Verifying transaction: done

Executing transaction: done

ERROR conda.core.link:_execute(637): An error occurred while installing 
package 'None'.

AssertionError()

Attempting to roll back.

Rolling back transaction: done

AssertionError()

I have also tried

~$ conda update --all

but it gave me the same error as before.

Answer 1

I had the same error, and I use miniconda, so I don't want to install anaconda. It worked for me to update python from 3.6 to 3.7 as follows:

$ conda install python=3.7

When I did this, conda updated automatically to the latest version.

Answer 2

Regarding this matter i have found a solution that is not well explained but solve the problem:

first : using the command :

~$ conda install anaconda 

this resolve the problem of the environment inconsistency .

second : using the command:

 ~$ conda update conda

the command will be executed with no problems and conda will be updated proberly.