Comment 0 for bug 2075968

After performing an upgrade, and then rebooting, I am no longer able to login with my user "ubuntu". I get an authentication failure with both the graphical login screen, and when attempting to login on a non-graphical tty.

Dropping to a rescue shell, I can see this in the logs:

root@xubuntu:~# journalctl -b --grep pam
Aug 02 11:52:45 xubuntu systemd[1]: systemd 255.4-1ubuntu8.2 running in system mode (+PAM +AUDIT +SELINUX +APPARMOR +IMA +SMACK +SECCOMP +GCRYPT -GNUTLS +OP>
Aug 02 11:53:00 xubuntu lightdm[1422]: pam_unix(lightdm-greeter:session): session opened for user lightdm(uid=115) by (uid=0)
Aug 02 11:53:00 xubuntu (systemd)[1472]: pam_unix(systemd-user:session): session opened for user lightdm(uid=115) by lightdm(uid=0)
Aug 02 11:53:00 xubuntu lightdm[1422]: gkr-pam: couldn't unlock the login keyring.
Aug 02 11:53:01 xubuntu lightdm[1584]: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "ubuntu"
Aug 02 11:53:40 xubuntu lightdm[1584]: pam_unix(lightdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost= user=ubuntu
Aug 02 11:53:42 xubuntu lightdm[1604]: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "ubuntu"
Aug 02 11:53:49 xubuntu lightdm[1604]: pam_unix(lightdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost= user=ubuntu
Aug 02 11:53:51 xubuntu lightdm[1605]: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "ubuntu"
Aug 02 11:53:58 xubuntu lightdm[1607]: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "root"
Aug 02 11:53:59 xubuntu lightdm[1607]: gkr-pam: unable to locate daemon control file
Aug 02 11:53:59 xubuntu lightdm[1607]: gkr-pam: stashed password to try later in open session
Aug 02 11:53:59 xubuntu lightdm[1422]: pam_unix(lightdm-greeter:session): session closed for user lightdm
Aug 02 11:53:59 xubuntu lightdm[1607]: pam_unix(lightdm:session): session opened for user root(uid=0) by (uid=0)
Aug 02 11:54:00 xubuntu (systemd)[1614]: pam_unix(systemd-user:session): session opened for user root(uid=0) by root(uid=0)
Aug 02 11:54:00 xubuntu lightdm[1607]: gkr-pam: unlocked login keyring
Aug 02 11:54:10 xubuntu (sd-pam)[1473]: pam_unix(systemd-user:session): session closed for user lightdm
Aug 02 11:55:01 xubuntu CRON[2417]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
Aug 02 11:55:01 xubuntu CRON[2417]: pam_unix(cron:session): session closed for user root

Other notes:

(1) During the upgrade, the screen saver was disabled. I know this has been a bug in the past, but I do not believe it is the cause here.
(2) A work around for this is to drop into a rescue shell, and from root, run e.g. `passwd ubuntu` to reset the user's password.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: libpam-modules 1.5.3-5ubuntu5.1
ProcVersionSignature: Ubuntu 6.8.0-39.39-generic 6.8.8
Uname: Linux 6.8.0-39-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CloudArchitecture: x86_64
CloudID: none
CloudName: none
CloudPlatform: none
CloudSubPlatform: config
CurrentDesktop: XFCE
Date: Fri Aug 2 11:55:51 2024
InstallationDate: Installed on 2024-07-30 (3 days ago)
InstallationMedia: Xubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64 (20240216.1)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: pam
UpgradeStatus: Upgraded to noble on 2024-08-02 (0 days ago)
mtime.conffile..etc.init.d.apport: 2024-04-23T07:30:10