nikita@nikita-desktop:~$ ssh root@ip_address
Unable to negotiate with ip_address port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,kexguess2@matt.ucc.asn.au
ssh -o KexAlgorithms=+diffie-hellman-group1-sha1 root@ip_address