Here are steps what i did for ssh key connection:
generated ssh key, the i checked /User/admin/.ssh/ here i have idrsa, idrsa.pub and known_hosts. I copied idrsa.pub to ~/.ssh/authorizedkeys - (I triple checked taht they are the same) (btw i used ssh root@ip) then i tried to connect to ssh root@ip again. but it doesnt accept the key(password auth method worked after pubkey fail). Ubuntu 18.04.
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