On Ubuntu 20.04, I tried cloning GitHub repository.(git clone (ssh url))
git clone git@github.com:scikit-learn/scikit-learn.git
But "git clone" command does not work. When I git clone repository (ssh), terminal does not ask passphrase of ssh.
I thought that ssh does not work on my PC, so I tried ssh -T git@github.com. It did not work.
When I tried ssh git@github.com, terminal did not ask passphrase, but it did work.
What is the problem with my git and ssh?