[Bug 2084453] Re: systemd 256 blocks root logins before systemd-user-sessions.service is up

[Gabriel de Perthuis]

** Description changed:

  In 24.10 oracular (this didn't happen in 24.04), it's impossible to
  connect to a machine before systemd-user-sessions.service is started.
  This is stricter than having /etc/nologin / /run/nologin / pam_nologin
  blocking logins, because it also applies to root logins.
  
  systemd-user-sessions waits for things like remote-fs.service, overall
  this makes it impossible to unlock encrypted partitions remotely or to
  troubleshoot boot issues without messing with the kernel command line
  through the boot loader.
- 
- This is fixed in systemd 256.7.
- Upstream patch: https://github.com/systemd/systemd/commit/278e815bfa3e4c2e3914e00121c37fc844cb2025 (https://github.com/systemd/systemd/pull/23936)
- Upstream bug report: https://github.com/systemd/systemd/issues/19264
- 
- Can this be backported from 256.7?  Or can ubuntu be updated to to that
- point release?
- 
- LC_ALL=C apt policy systemd
- systemd:
-   Installed: 256.5-2ubuntu3
-   Candidate: 256.5-2ubuntu3
-   Version table:
-  *** 256.5-2ubuntu3 1000
-        1000 http://fr.archive.ubuntu.com/ubuntu oracular/main amd64 Packages
-         100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/2084453

Title:
  systemd 256 blocks root logins before systemd-user-sessions.service is
  up

Status in systemd package in Ubuntu:
  New

Bug description:
  In 24.10 oracular (this didn't happen in 24.04), it's impossible to
  connect to a machine before systemd-user-sessions.service is started.
  This is stricter than having /etc/nologin / /run/nologin / pam_nologin
  blocking logins, because it also applies to root logins.

  systemd-user-sessions waits for things like remote-fs.service, overall
  this makes it impossible to unlock encrypted partitions remotely or to
  troubleshoot boot issues without messing with the kernel command line
  through the boot loader.

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