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I'm installing on a raspberry pi, device is fine as I'm converting from raspbian.

Followed the account setup and install as per:
https://www.ubuntu.com/download/iot/raspberry-pi-2-3

I've generated an SSH key pair and uploaded to my ubunto one account.
I'm using Mobaxterm as a terminal program. Is there some problem with the key validation?
The terminal log shows that the key is accepted (right? The fingerprint matches that shown on the remote server)

ssh -v johnmcdnz@192.168.1.24

OpenSSH_7.1p2, OpenSSL 1.0.1g 7 Apr 2014

debug1: Reading configuration data /etc/ssh_config

debug1: Connecting to 192.168.1.24 [192.168.1.24] port 22.

debug1: Connection established.

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_rsa type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_rsa-cert type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_dsa type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_dsa-cert type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_ecdsa type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_ecdsa-cert type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_ed25519 type -1

debug1: key_load_public: No such file or directory

debug1: identity file /home/mobaxterm/.ssh/id_ed25519-cert type -1

debug1: Enabling compatibility mode for protocol 2.0

debug1: Local version string SSH-2.0-OpenSSH_7.1

debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.1

debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.1 pat OpenSSH* compat 0x04000000

debug1: Authenticating to 192.168.1.24:22 as 'johnmcdnz'

debug1: SSH2_MSG_KEXINIT sent

debug1: SSH2_MSG_KEXINIT received

debug1: kex: server->client aes128-ctr hmac-sha1 zlib@openssh.com

debug1: kex: client->server aes128-ctr hmac-sha1 zlib@openssh.com

debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

debug1: Server host key: ssh-rsa SHA256:OXGzdP3EuoHBPEbhwf7jWxDVwaIkK+jht06HBB08BAI

debug1: Host '192.168.1.24' is known and matches the RSA host key.

debug1: Found key in /home/mobaxterm/.ssh/known_hosts:1

debug1: SSH2_MSG_NEWKEYS sent

debug1: expecting SSH2_MSG_NEWKEYS

debug1: SSH2_MSG_NEWKEYS received

debug1: SSH2_MSG_SERVICE_REQUEST sent

debug1: SSH2_MSG_SERVICE_ACCEPT received

debug1: pubkey_prepare: ssh_fetch_identitylist: agent refused operation

debug1: Authentications that can continue: publickey,password

debug1: Next authentication method: publickey

debug1: Trying private key: /home/mobaxterm/.ssh/id_rsa

debug1: Trying private key: /home/mobaxterm/.ssh/id_dsa

debug1: Trying private key: /home/mobaxterm/.ssh/id_ecdsa

debug1: Trying private key: /home/mobaxterm/.ssh/id_ed25519

debug1: Next authentication method: password  

johnmcdnz@192.168.1.24's password:

debug1: Authentications that can continue: publickey,password

johnmcdnz@192.168.1.24's password:

debug1: Authentications that can continue: publickey,password

johnmcdnz@192.168.1.24's password:

I friend ... look your first information, debug1: Reading configuration data /etc/ssh_config
you see and remove comments on this file? this is necessary to work, if you do not remove the comments it will work as a standard (#).

Try removing comments: (#RSAAuthentication yes) or (# RhostsRSAAuthentication yes)
change default "no" to "yes"

Other lines need to have your comments removed too, see some tips on the internet about ssh, I will not put everything here would be extended the answer.

Any time you change /etc/ssh/ssh_config, run for restart:
service ssh restart
verify if this is on command: service ssh status (if have any error this command show)
sorry about my English, I hope I've helped.