in fact the issue seems to be with pam_fprint.so, reassigning to libpam- fprint
** Also affects: pam-fprint (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/963025 Title: lightdm assert failure: *** glibc detected *** lightdm: double free or corruption (!prev): 0x0000000001c34f30 *** Status in “lightdm” package in Ubuntu: Incomplete Status in “pam-fprint” package in Ubuntu: New Bug description: The ubuntu not login and return to lighgm. I change to gdm and work. ProblemType: Crash DistroRelease: Ubuntu 12.04 Package: lightdm 1.1.9-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12 Uname: Linux 3.2.0-20-generic x86_64 NonfreeKernelModules: fglrx ApportVersion: 1.95-0ubuntu1 Architecture: amd64 AssertionMessage: *** glibc detected *** lightdm: double free or corruption (!prev): 0x0000000001c34f30 *** Date: Fri Mar 23 07:50:07 2012 ExecutablePath: /usr/sbin/lightdm InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120315) ProcCmdline: lightdm --session-child 12 25 ProcCwd: / ProcEnviron: TERM=linux PATH=(custom, no user) Signal: 6 SourcePackage: lightdm Title: lightdm assert failure: *** glibc detected *** lightdm: double free or corruption (!prev): 0x0000000001c34f30 *** UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/963025/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp