Upgraded to Ubuntu 22.04 and having SSH problems...

[acosonic]

More specifically:

2023-10-11 07:16:48 -0400 [ERROR] Invalid Gitolite Admin SSH Keys
2023-10-11 07:16:48 -0400 [ERROR] Failed to retrieve list of SSH authentication methods: Failed getting response

System info:

Environment:
  Redmine version                4.1.0.stable.19444
  Ruby version                   2.6.5-p114 (2019-10-01) [x86_64-linux]
  Rails version                  5.2.4.1
  Environment                    production
  Database adapter               Mysql2
  Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
  Mailer delivery                smtp
SCM:
  Subversion                     1.14.1
  Git                            2.34.1
  Filesystem                     
  Xitolite                       2.34.1
Redmine plugins:
  additionals                    3.0.4
  disable_activity               0.0.1
  redmine_agile                  1.6.2
  redmine_contacts               4.3.0
  redmine_dmsf                   2.4.5
  redmine_git_hosting            5.0.1-master

Any suggestions?

[acosonic]

I have tried to generate new keys using:

ssh-keygen -m PEM -N '' -f ssh_keys/redmine_gitolite_admin_id_rsa

[acosonic]

Fixed by adding:
PubkeyAcceptedAlgorithms +ssh-rsa
to
/etc/ssh/sshd_config

then restarting systemctl restart sshd

It worked for me, after hours of unsucessful fixes since I followed wrong leads...

till it came to my mind to take a look at /var/log/auth.log