CLIENT_UNAUTHORIZED [769] after update ubuntu

Question

Hi, I'm trying access to my instance by lightsail browser ssh window, and I receive the error CLIENT_UNAUTHORIZED [769]

This happened after update to the last version of ubuntu.

I tried conecting via ssh by terminal, but 
             
ubuntu@xx.x.xx.x: Permission denied (publickey).

I tried adding the lines in /etc/ssh/sshd_config, but still not works

```
   TrustedUserCAKeys /etc/ssh/lightsail_instance_ca.pub

CASignatureAlgorithms +ssh-rsa
```

how can I fix it?

Accepted Answer

Hello.

The answers below may be helpful.  
https://repost.aws/questions/QUVeeNlkylRxGFJDg4BGy_YQ/i-recently-have-created-an-instance-and-not-ssh-shows-an-error-after-update#ANzIxtnANAQ-axnDdIOPvpfQ

Since you probably cannot connect via SSH, you may be able to fix this by creating a snapshot and configuring the settings from the startup script when starting Lightsail from the snapshot.

Also, check out "You upgraded your Ubuntu instance version to 20.04 or later" in the following documentation:  
https://repost.aws/knowledge-center/lightsail-resolve-ssh-console-errors

CLIENT_UNAUTHORIZED [769] after update ubuntu

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