This appears to be a breakage related to ssh-agent.socket.
On my questing system, ssh-socket.service is listening on
$XDG_RUNTIME_DIR/openssh_agent, but SSH_AUTH_SOCK is not set in my
environment.
ubuntu@q-vm:~$ systemctl --user status ssh-agent.socket
● ssh-agent.socket - OpenSSH Agent socket
Loaded: loaded (/usr/lib/systemd/user/ssh-agent.socket; enabled; preset:
enabled)
Active: active (listening) since Wed 2025-09-24 13:49:25 UTC; 6min ago
Invocation: 23fe2f1f95f04f8386666cc05887bdd3
Triggers: ● ssh-agent.service
Docs: man:ssh-agent(1)
Listen: /run/user/1000/openssh_agent (Stream)
Process: 25258 ExecStartPost=/usr/bin/systemctl --user set-environment
SSH_AUTH_SOCK=/run/user/1000/openssh_agent (code=exited, status=0/SUCCESS)
Tasks: 0 (limit: 986)
Memory: 4K (peak: 1.7M)
CPU: 4ms
CGroup:
/user.slice/user-1000.slice/[email protected]/app.slice/ssh-agent.socket
Sep 24 13:49:25 q-vm systemd[25248]: Starting ssh-agent.socket - OpenSSH Agent
socket...
Sep 24 13:49:25 q-vm systemd[25248]: Listening on ssh-agent.socket - OpenSSH
Agent socket.
ubuntu@q-vm:~$ env | grep SSH_
It's unclear to me if the `systemctl --user set-environment` call in
ssh-agent.socket is intended to hook things up in the user session, but
that's not what it does.
I will keep digging.
See also:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961311
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1039919
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1103037
** Bug watch added: Debian Bug tracker #961311
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961311
** Bug watch added: Debian Bug tracker #1039919
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1039919
** Bug watch added: Debian Bug tracker #1103037
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1103037
** Changed in: openssh (Ubuntu)
Status: New => Confirmed
** Changed in: openssh (Ubuntu)
Importance: Undecided => Critical
** Changed in: openssh (Ubuntu)
Assignee: (unassigned) => Nick Rosbrook (enr0n)
** Changed in: openssh (Ubuntu)
Milestone: None => ubuntu-25.10
** Tags added: dcr-incoming
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https://bugs.launchpad.net/bugs/2125549
Title:
ssh agent no longer work a questing upgrade
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