ssh send_pubkey_test: no mutual signature algorithm

Create or edit your ssh config file. This file is located at /home/{user}/.ssh/config

Now add ssh config for host you cant connect

Host {ip address of remote server}
    PubkeyAcceptedAlgorithms +ssh-rsa

It tells ssh client to use rsa algorithm when connecting to remote server. This happens when connecting to older ssh servers

For realy old ssh servers try adding this line

HostKeyAlgorithms +ssh-dss