This is documented in the release note for Jammy Jellyfish
(https://discourse.ubuntu.com/t/jammy-jellyfish-release-notes/24668):
ssh-rsa is now disabled by default in OpenSSH 237.
The release notes also contain a link to a way to continue connetcing to
servers configured with ssh-rsa.
** Changed in: openssh (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1971158
Title:
ssh connect to server stop on "SSH2_MSG_KEXINIT sent"
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