Erro SSH: “no matching key exchange method found. Their offer: diffie-hellman-group1-sha1”

 Solução: 

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 root@192.168.1.1

Fonte: 

https://blog.ffelix.eti.br/ssh-no-matching-key-exchange-method-found-their-offer-diffie-hellman-group1-sha1/