Gute Information

sudo mg /etc/ssh/ssh_config
->
HostkeyAlgorithms ssh-dss,ssh-rsa
KexAlgorithms +diffie-hellman-group1-sha1,diffie-hellman-group14-sha1

!
how_ever:
cp key_rsa_server.pub id_rsa.pub
cp key_rsa_server id_rsa

ebenso:
~/.ssh/config:

Host * 
HostkeyAlgorithms +ssh-rsa 
PubkeyAcceptedAlgorithms +ssh-rsa