Public bug reported:
Problem Description:
When pam_fprintd.so is enabled in the system's common-auth PAM configuration,
cron jobs fail to execute, consistently logging "Failure setting user
credentials" in the system logs.
[ This indicates that pam_fprintd.so (or its underlying fprintd daemon
interaction) does not gracefully handle execution within a non-
interactive, headless cron environment, thereby preventing scheduled
tasks from running. ]
Steps to Reproduce:
- Ensure libpam-fprintd and fprintd packages are installed.
*** remove the fprintd package. For me it was somehow done when doing ubuntu
dist-upgrade from 22.04 to 24.04, leaving the SO file,
- Ensure /etc/pam.d/cron is in its default state, containing @include
common-auth.
- Ensure /etc/pam.d/common-auth includes the pam_fprintd.so line, specifically:
auth [success=3 default=ignore] pam_fprintd.so max-tries=1 timeout=10
- Add a simple test cron job for any user
- Restart cron: sudo systemctl restart cron.
- Observe system logs for cron messages.
---------------
system:
$ apt-cache policy libpam-fprintd fprintd
libpam-fprintd:
Installed: (none)
Candidate: 1.94.3-1
Version table:
1.94.3-1 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
fprintd:
Installed: (none)
Candidate: 1.94.3-1
Version table:
1.94.3-1 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
cnoam@noam-u:~$ sudo find /lib /usr -name "pam_fprintd.so"
/usr/lib/x86_64-linux-gnu/security/pam_fprintd.so
cnoam@noam-u:/etc/pam.d$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.2 LTS
Release: 24.04
Codename: noble
cnoam@noam-u:/etc/pam.d$ uname -a
Linux noam-u 6.8.0-62-generic #65-Ubuntu SMP PREEMPT_DYNAMIC Mon May 19
17:15:03 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
HARDWARE: Lenovo Thinkpad 16s
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: libpam-fprintd (not installed)
ProcVersionSignature: Ubuntu 6.8.0-62.65-generic 6.8.12
Uname: Linux 6.8.0-62-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.7
Architecture: amd64
CasperMD5CheckMismatches: ./.disk/casper-uuid-oem ./boot/grub/efi.img
./boot/grub/grub.cfg ./casper/initrd
CasperMD5CheckResult: fail
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 23 11:07:31 2025
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-sutton-jammy-amd64-20240613-884
InstallationDate: Installed on 2024-06-28 (360 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" -
pc-sutton-jammy-amd64-20240613-884
SourcePackage: fprintd
UpgradeStatus: Upgraded to noble on 2025-03-15 (100 days ago)
** Affects: fprintd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to fprintd in Ubuntu.
https://bugs.launchpad.net/bugs/2115182
Title:
cron fails with "Failure setting user credentials" when pam_fprintd.so
is referenced in common-auth
Status in fprintd package in Ubuntu:
New
Bug description:
Problem Description:
When pam_fprintd.so is enabled in the system's common-auth PAM configuration,
cron jobs fail to execute, consistently logging "Failure setting user
credentials" in the system logs.
[ This indicates that pam_fprintd.so (or its underlying fprintd daemon
interaction) does not gracefully handle execution within a non-
interactive, headless cron environment, thereby preventing scheduled
tasks from running. ]
Steps to Reproduce:
- Ensure libpam-fprintd and fprintd packages are installed.
*** remove the fprintd package. For me it was somehow done when doing ubuntu
dist-upgrade from 22.04 to 24.04, leaving the SO file,
- Ensure /etc/pam.d/cron is in its default state, containing @include
common-auth.
- Ensure /etc/pam.d/common-auth includes the pam_fprintd.so line,
specifically: auth [success=3 default=ignore] pam_fprintd.so max-tries=1
timeout=10
- Add a simple test cron job for any user
- Restart cron: sudo systemctl restart cron.
- Observe system logs for cron messages.
---------------
system:
$ apt-cache policy libpam-fprintd fprintd
libpam-fprintd:
Installed: (none)
Candidate: 1.94.3-1
Version table:
1.94.3-1 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
fprintd:
Installed: (none)
Candidate: 1.94.3-1
Version table:
1.94.3-1 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
cnoam@noam-u:~$ sudo find /lib /usr -name "pam_fprintd.so"
/usr/lib/x86_64-linux-gnu/security/pam_fprintd.so
cnoam@noam-u:/etc/pam.d$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.2 LTS
Release: 24.04
Codename: noble
cnoam@noam-u:/etc/pam.d$ uname -a
Linux noam-u 6.8.0-62-generic #65-Ubuntu SMP PREEMPT_DYNAMIC Mon May 19
17:15:03 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
HARDWARE: Lenovo Thinkpad 16s
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: libpam-fprintd (not installed)
ProcVersionSignature: Ubuntu 6.8.0-62.65-generic 6.8.12
Uname: Linux 6.8.0-62-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.7
Architecture: amd64
CasperMD5CheckMismatches: ./.disk/casper-uuid-oem ./boot/grub/efi.img
./boot/grub/grub.cfg ./casper/initrd
CasperMD5CheckResult: fail
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 23 11:07:31 2025
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-sutton-jammy-amd64-20240613-884
InstallationDate: Installed on 2024-06-28 (360 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" -
pc-sutton-jammy-amd64-20240613-884
SourcePackage: fprintd
UpgradeStatus: Upgraded to noble on 2025-03-15 (100 days ago)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/fprintd/+bug/2115182/+subscriptions
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