3

I have a running ec2 instance and I was able to connect with ssh (PEM) file with ubuntu 20.04.5 LTS however it is not working after upgrading to ubuntu 22.04.1 LTS. I have not changed any settings or anything else. The auth log shows the following error

userauth_pubkey: key type ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]

Please help to resolve the issue

UPDATE

This is the notification I have on ec2

Authenticating with public key "imported-openssh-key"
Welcome to Ubuntu 20.04.5 LTS (GNU/Linux 5.15.0-1019-aws x86_64)

    

  • Documentation:  https://help.ubuntu.com
    • 

  • Management:     https://landscape.canonical.com
    • 

  • Support:        https://ubuntu.com/advantage
    • 



System information as of Mon Sep  5 13:09:50 UTC 2022


System load:  0.0               Processes:             102
  Usage of /:   35.7% of 7.57GB   Users logged in:       0
  Memory usage: 15%               IPv4 address for ens5: IP
  Swap usage:   0%


0 updates can be applied immediately.


New release '22.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
Vikram
  • 131

1 Answers1

3

Put the following in your /etc/ssh/ssh_config:

PubkeyAcceptedKeyTypes +ssh-rsa
HostKeyAlgorithms +ssh-rsa

This will allow the SSH client to connect using the deprecated algorithms.

Also see here and here.

Artur Meinild
  • 31,035