Server refused out key problem in 22.04LTS. The same procedure works fine in 20.04LTS.
public key is in ~/.ssh/authorized_keys. change mode is correct.
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Is this afresh installation or a release upgrade? – ChanganAuto May 21 '22 at 01:20
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check permissions on ~ssh and files in it – user10489 May 21 '22 at 04:43
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Are you logging in with an AD account ? I see you already checked permissions. – Jeff Dickens Jun 02 '22 at 19:55
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5Does this answer your question? SSH without password does not work after upgrading from 18.04 to 22.04 – user68186 Jun 04 '22 at 22:31
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The solution for me was to use ECDSA algorithm for creating the keypair.
You can create it with this command: ssh-keygen -t ecdsa -b 521
(521 is the maximum and recommended key size).
I learned this was needed from a comment in this DO article.
antishok
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Other solutions to the same issue: https://askubuntu.com/questions/1404049/ssh-without-password-does-not-work-after-upgrading-from-18-04-to-22-04 – antishok Jun 04 '22 at 22:30