I have created an environment called B3 inside anaconda-navigator. It works fine if launched from within navigator.
However, when I want to activate it at the shell, I get 'could not find environmnet B3.'
If I use conda env list, the environment is visible but its name is blank. If I try using the file path instead, I get 'Not a conda environment.'
Why is the name missing, and how can I activate it from the shell?
Name-based reference of Conda environments only works for environments located in one of the directories listed in the envs_dirs
configuration option (see conda config --describe envs_dirs
). By default this corresponds to the envs/
subdirectory in the Conda installation. If you create an env outside of one of these directories, then you cannot use a name to reference it. Instead, one must activate it by its path:
conda activate /home/julianhatwell/anaconda3/envs/B3
Note that OP originally had a typo ( anaconda2
should have been anaconda3
). After pointing this out (see comments to question), the questioner instead requested an answer to:
“ How to convert a nameless environment to named one? ”
The following are possible ways to enabling name-based activation.
One option to use conda activate B3
, is to recreate your B3 env in the default directory. You can use the --clone
flag to accomplish this.
conda create --clone path/to/the/nameless_env -n named_env
Alternatively, you can add the parent directory of the environment in question to the envs_dirs
configuration option.
conda config --append envs_dirs /path/to/the/parent_dir
Another possibility is to create a symbolic link in one to the envs_dirs
folders to the environment folder. It seems to work, but it is not a common practice, so it may have downsides that are unreported.
When you create a conda env with --prefix, it will not have a name, and to give one do the following:
# ex path: /Users/username/opt/miniconda3/envs/`
conda config --append envs_dirs <path to env folder here>
To activate the environment:
conda activate <name of the env>
To get the list of the available environments use:
conda env list
To activate the nameless environment use:
conda activate <Folder>
Faced a similar issue on Apple M1 chip
due to installation of miniforge3 and miniconda
in two different paths.
My solution Edit the .bash_profile
It is most likely that you have ps1 value set to False, which enables prompt change with change of conda environment.
To check run from your ubuntu terminal:
$ conda config --show | grep changeps1
And set it to True using:
$ conda config --set changeps1 True
After this, you should see the currently activated conda environment name at the beginning of each prompt. PS - You may have to close and reopen the terminal for this to take effect.
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