Ubuntu add to server local site

ssh -oHostKeyAlgorithms=+ssh-dss root@192.168.0.1

~/.ssh/config

Host nas (kancllocal)

  HostName 192.168.0.1

  HostKeyAlgorithms=+ssh-dss

Check ssh key
ls ~/.ssh/id_rsa ~/.ssh/id_rsa.pub

Generate key pair

ssh-keygen -t rsa -b 4096

Copy to server

or copy manualy

cat ~/.ssh/id_rsa.pub | ssh user@remote-server "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"

check server configuration:
sudo nano /etc/ssh/sshd_config

restart sshd

sudo systemctl restart ssh