ssh localhost requires password

[AndrzejB]

I try install hadoop and hbase (https://www.tutorialspoint.com/hbase/hb ... lation.htm)
I can do for my hadoop user:
Change user to hadoop:
sudo apt-get install openssh-server
ssh-keygen -t rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 0600 ~/.ssh/authorized_keys
Verify ssh
ssh localhost

But i can't it for my user.
ssh localhost requires always password

Not helps anwer for https://askubuntu.com/questions/577357/ ... tlocalhost

[AndrzejB]

$ ssh localhost@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:a9i......0JXfI.
Please contact your system administrator.
Add correct host key in /home/andrzej/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/andrzej/.ssh/known_hosts:5
remove with:
ssh-keygen -f "/home/andrzej/.ssh/known_hosts" -R localhost
ECDSA host key for localhost has changed and you have requested strict checking.
Host key verification failed.