Sometime back, the maintainer of kde-agent removed the package. As a work around for providing a solution to ssh-agent for all session terminals, I lift the following solution from ArchLinux: ssh-agent support removed from kde-agent and ArchLinux: ssh keys:
In ~/.config/systemd/user/ssh-agent.service, put the following code:
[Unit] Description=SSH key agent [Service] Type=forking Environment=SSH_AUTH_SOCK=%t/ssh-agent.socket ExecStart=/usr/bin/ssh-agent -a $SSH_AUTH_SOCK [Install] WantedBy=default.target
Append to ~/.bashrc:
export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/ssh-agent.socket"
Enable the service with:
systemctl --user enable ssh-agent
And start with:
systemctl --user start ssh-agent