Fedora –
Install openssh-server as below
sudo yum install openssh-server
or if you are not in sudoer list , become root user and install openssh-server (yum install openssh-server)
Ubuntu –
Install openssh-server –
sudo apt-get install openssh-server
or if you are not in sudoer list , become root user and install openssh-server (apt-get install openssh-server)