This bug was fixed in the package systemd - 204-0ubuntu19.1
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systemd (204-0ubuntu19.1) saucy-proposed; urgency=low
* Add pam-check-runtime-dir-user.patch: Don't set an existing
$XDG_RUNTIME_DIR in the PAM module if it isn't owned by the session user.
Otherwise su
Uploaded fix for saucy, now waiting for SRU team to review/accept.
** Also affects: systemd (Ubuntu Saucy)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu Saucy)
Status: New = In Progress
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This bug was fixed in the package systemd - 204-5ubuntu6
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systemd (204-5ubuntu6) trusty; urgency=low
* Add pam-check-runtime-dir-user.patch: Don't set an existing
$XDG_RUNTIME_DIR in the PAM module if it isn't owned by the session user.
Otherwise su sessions get a
