Puttygen passphrase git

I'm working to a project in git. In Windows, I'm using git extensions to manage this project, and to access to the public repository they gave me a .ppk key. I load it into git extension, with the passphrase that they gave me, and it works.

Now I set a linux (ubuntu-32bit) virtual machine, and I want to access also from this machine to the repository.

From another thread that I've seen in this site, I use, to clone the repository, the following command:

ssh-agent bash -c 'ssh-add /home/myHome/mykey.ppk; git clone git@serveraddress:project.git' Then, the shell tells me to insert the passphrase

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