[Bug 1961833] Re: openssh 8.8 breaks login to Canonical servers

[Dan Streetman]

Note: this also affects anyone trying to connect to the dev.azure.com
servers (to, for example, git clone git at ssh.dev.azure.com...)

$ ssh -vv ssh.dev.azure.com
...
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha256
debug2: host key algorithms: ssh-rsa
...
Unable to negotiate with 20.41.6.2 port 22: no matching host key type found. Their offer: ssh-rsa

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https://bugs.launchpad.net/bugs/1961833

Title:
  openssh 8.8 breaks login to Canonical servers

Status in openssh package in Ubuntu:
  Won't Fix

Bug description:
  With 8.7p1-4 connecting to wendigo

  debug1: Next authentication method: publickey
  debug1: Offering public key: /home/jak/.ssh/id_rsa RSA SHA256:Dj1/l9g5RH00/wO7puC1WVxgpvmhmaQg3wEETwmOFPk agent
  debug1: Server accepts key: /home/jak/.ssh/id_rsa RSA SHA256:Dj1/l9g5RH00/wO7puC1WVxgpvmhmaQg3wEETwmOFPk agent

  With 8.8p1-1

  debug1: Offering public key: /home/jak/.ssh/id_rsa RSA SHA256:Dj1/l9g5RH00/wO7puC1WVxgpvmhmaQg3wEETwmOFPk agent                                                                                                                                                                             
  debug1: send_pubkey_test: no mutual signature algorithm   

  
  Needs further investigation, but blocks people a bit right now

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