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Lightsail ssh not working after Ubuntu Upgrade 18.04 to 20.04
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How to resolve while upgrading Ubuntu 18.04 into 20.04  
1) Open the instance on Terminal or Putty.
    ssh -i ssh-pair-key-new.pem bitnami@99.99.99.99

2) Edit the sshd_config file using. 
    Run: sudo vi /etc/ssh/sshd_config
 
3) Replace or Add CASignatureAlgorithms into the sshd_config file.
   CASignatureAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
 
4) Restart the sshd service.
    Run. sudo systemctl restart sshd
 
I hope your Connect to Browser SSH should work.
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