error: cannot run ssh: No such file or directory when trying to clone on windows

Check if you have installed ssh-client. This solve the problem on docker machines, even when ssh keys are present:

apt-get install ssh-client

windows git git-flow

You don't have ssh installed (or don't have it within your search path).

You can clone from github via http, too:

git clone http://github.com/organization/xxx

windows git git-flow

Most likely your GIT_SSH_COMMAND is referencing the incorrect public key.

Try:

export GIT_SSH_COMMAND="ssh -i /home/murphyslaw/.ssh/your-key.id_rsa

then

git clone git@github.com:organization/xxx.git

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