Public bug reported:
On Ubuntu 26.04 (util-linux / libpam-lastlog2 2.41.3-3ubuntu2.2, systemd
259.5-0ubuntu3.4),
every start of [email protected] logs:
(systemd)[3271]: PAM unable to dlopen(pam_lastlog2.so):
/usr/lib/security/pam_lastlog2.so: cannot open shared object file: No such file
or directory
(systemd)[3271]: PAM adding faulty module: pam_lastlog2.so
The real failure is hidden by libpam's fallback path. Loading the module with
libpam opened RTLD_LOCAL (as systemd-executor does, since systemd dlopens
libpam)
gives:
pam_lastlog2.so: error: symbol lookup error: undefined symbol:
pam_syslog
pam_lastlog2.so has no NEEDED entry for libpam.so.0:
(NEEDED) Shared library: [libc.so.6]
whereas e.g. pam_wtmpdb.so correctly lists libpam.so.0. The module is pulled in
via /etc/pam.d/other -> common-session.
This is fixed upstream in util-linux 2.42.2 ("pam_lastlog2: fix libpam linking
in
autotools build", commit 5683ed6320e00205146cbb3d0c76462733530eca, plus the
earlier
3f4cbd7a1510 "add -lpam to Makemodule.am"): -lpam was in LDFLAGS and got dropped
by --as-needed; it now lives in pam_lastlog2_la_LIBADD. Same bug in Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=2453457
Please backport that change to resolute's util-linux.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: libpam-lastlog2 2.41.3-3ubuntu2.2
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 11 12:01:49 2026
InstallationDate: Installed on 2026-08-13 (28 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Summary changed:
- "undefined symbol: pam_syslog" when loaded by systemd-executor
+ pam_lastlog2.so not linked against libpam: "undefined symbol: pam_syslog"
when loaded by systemd-executor
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https://bugs.launchpad.net/bugs/2167039
Title:
pam_lastlog2.so not linked against libpam: "undefined symbol:
pam_syslog" when loaded by systemd-executor
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