package gdm 3.8.4-0ubuntu2 failed to install/upgrade: subprocess installed post-removal script returned error exit status 128

No clue, sessions stopped working after a reboot following an update, with lots of errors that I guess are those reported now. After login I got black screen with a white mouse and nothing else. Sometimes errors ("Cancel" "Report bug") windows without decoration...

It started working again after I updated, dist-upgrades installed lxde and chose it as a session. Bad breakin completely X sessions, I had no way to get network access or research/report the errors

ProblemType: Package
DistroRelease: Ubuntu 13.10
Package: gdm 3.8.4-0ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-32.47-generic 3.8.13.10
Uname: Linux 3.8.0-32-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
AptOrdering:
 gnome: Purge
 gnome-core: Purge
 gdm: Purge
Architecture: amd64
Date: Sat Nov 16 16:53:07 2013
DuplicateSignature: package:gdm:3.8.4-0ubuntu2:subprocess installed post-removal script returned error exit status 128
ErrorMessage: subprocess installed post-removal script returned error exit status 128
InstallationDate: Installed on 2013-07-23 (117 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: gdm
Title: package gdm 3.8.4-0ubuntu2 failed to install/upgrade: subprocess installed post-removal script returned error exit status 128
UpgradeStatus: Upgraded to saucy on 2013-10-29 (18 days ago)