Basic usage of SSH keys import, export, and generate

Create SSH keys

ssh-keygen -t rsa -b 4096 -C "laptop@vlan1"

Export public key to remote server

cat ~/.ssh/id_rsa.pub | ssh user@192.168.0.13 'cat >> .ssh/authorized_keys'

Other troubleshooting

Allow Password authentication

sudo nano /etc/ssh/sshd_config
PasswordAuthentication yes
sudo systemctl restart ssh

or

PermitRootLogin yes

Install ssh server

sudo apt install openssh-server

Re-generate SSH keys or complete missing keys

sudo ssh-keygen -A