package gdm 3.0.4-0ubuntu15 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 127

[Steve Thompson]

I was performing a dist-upgrade and this happened. I assume it's a bug because the upgrade process said it was

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: gdm 3.0.4-0ubuntu15
ProcVersionSignature: Ubuntu 2.6.32-41.94-hostname 2.6.32.59+drm33.24
Uname: Linux 2.6.32-41-server x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
Date: Sat Sep 1 00:14:36 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 127
InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
SourcePackage: gdm
Title: package gdm 3.0.4-0ubuntu15 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 127
UpgradeStatus: Upgraded to precise on 2012-08-31 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.