It says
Incompatibility is more likely when connecting to older SSH
implementations that have not been upgraded or have not closely tracked
improvements in the SSH protocol. For these cases, it may be necessary
to selectively re-enable RSA/SHA1 to allow connection and/or user
authentication via the HostkeyAlgorithms and PubkeyAcceptedAlgorithms
options. For example, the following stanza in ~/.ssh/config will enable
RSA/SHA1 for host and user authentication for a single destination host:
Host old-host
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa
So this may be a server too old issue; and we can fix this in internal
tooling.
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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:
New
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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