conda init gives me "no action taken"

While this does not try to fix this problem, rather helps as a workaround when I want to activate an env.

$ source ~/anaconda3/bin/activate <env_name>

I had the same problem. Previously I had anaconda 2 but I removed to install anaconda 3. After installing anaconda 3 and using conda init I got the same error message, as I solved it. Enter your .bashrc:

gedit ~/.bashrc

Identify the following lines in the .bashrc file and delete them:

# >>> conda initialize >>>
# !! Contents within this block are managed by 'conda init' !!
__conda_setup = "$ ('/ home / spidey / anaconda3 / bin / conda' 'shell.bash' 
'hook' 2> / dev / null)"
if [$? -eq 0]; then
    eval "$ __ conda_setup"
else
    if [-f "/home/spidey/anaconda3/etc/profile.d/conda.sh"]; then
        . "/home/spidey/anaconda3/etc/profile.d/conda.sh"
    else
        export PATH = "/ home / spidey / anaconda3 / bin: $ PATH"
    fi
fi
unset __conda_setup
# <<< conda initialize <<<

Explanation:
Since previously you already had an anaconda installation, the conda init command did not modify anything because it detected that you had already made changes to the .bashrc file.

Try By Using anaconda-navigator:

activate conda:

$ source ~/anaconda3/bin/activate root

Launch conda:

$ anaconda-navigator

If you want to launch JupyterNotebook simply run

jupyter notebook

As far as I understand this, conda init [shell] is used to initiate a specific shell utilized when executing command-line conda commands. Not specifying one will default it to bash, which I'm guessing is what you already use here—since this is the output.

More information can be found by using the [-h] flag:

$ conda init -h

Use this instead:

conda activate
jupyter notebook

I found the solution

/opt/conda/bin/conda init zsh

as it states here (from /opt/conda/bin/conda init -h )

positional arguments: shells One or more shells to be initialized. If not given, the default value is 'bash' on unix and 'cmd.exe' on Windows. Use the '--all' flag to initialize all shells. Currently compatible shells are {bash, fish, powershell, tcsh, xonsh, zsh}

This is weird because I did not have this problem before while setting up another server. But anyway it is clear that you need to specify the shell (which is zsh here), otherwise conda will pick up bash as default shell.

source ~/.bashrc or source ~/.bash_profile should work