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After installing Ubuntu core 22 on the raspberry 3 mode B+. I cannot login by ssh. I try to use similar password with my account but not successfully.

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    I think password based ssh login is disabled in Ubuntu Core. You should have uploaded the public key to the website during, or after installation for key based login.
    – user68186
    Jun 7, 2022 at 13:37

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That is correct what @user68186 is saying. You need to create your own keys

ssh-keygen -t rsa -b 4096 -C "[email protected]"

This will generate 2 keys in your private directory. Type ls from where you execute the key generation.

And then add the public key to Ubuntu One: https://login.ubuntu.com/ssh-keys

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