kdeinit4: Communication error with launcher ; KDE 4.7.2 stuck at kdmgreet

[Rohit]

I'm using Kubuntu 11.10. Using KDM to log in to KDE 4.7.2 - all updates applied.
8 Packages were updated today after which I am unable to log into KDE.
Restarting DBus service did not help.

[/var/log/apt/history.log]
Start-Date: 2011-11-01 17:54:22
Commandline: apt-get upgrade
Upgrade: apport:i386 (1.23-0ubuntu3, 1.23-0ubuntu4), libcups2:i386 (1.5.0-8ubunt
u3, 1.5.0-8ubuntu4), python-problem-report:i386 (1.23-0ubuntu3, 1.23-0ubuntu4), libcupsimage2:i386 (1.5.0-8ubuntu3, 1.5.0-8ubuntu4), python-apport:i386 (1.23-0ubuntu3, 1.23-0ubuntu4), apport-kde:i386 (1.23-0ubuntu3, 1.23-0ubuntu4), python-gobject:i386 (3.0.0-0ubuntu3, 3.0.0-0ubuntu4), python-gobject-cairo:i386 (3.0.0-0ubuntu3, 3.0.0-0ubuntu4)
End-Date: 2011-11-01 17:54:41

[/var/log/kdm.log]
klauncher(4153) kdemain: No DBUS session-bus found. Check if you have started the DBUS server.
kdeinit4: Communication error with launcher. Exiting!
kdmgreet(4145)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed: "Not connected to D-Bus server"
kdmgreet(4145)/kdecore (K*TimeZone*): No time zone information obtained from ktimezoned
QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such file or directory
QFileSystemWatcher: failed to add paths: /tmp/1125679298/.config/ibus/bus

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Tue Nov 1 18:49:03 2011
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)

[ari197 (arianto-nugroho)]

I'm also having the same problem. After entering login and password, screen turns blank and nothing happened.
Looking at the logs, I have the same errors.

[Frédéric Nass (nass)]

Hi,

I had the sames isues with 11.10 just after removing the KDE standard bluetooth manager.
I think this is related to a misconfiguration or abusive removal of some KDE key packages.
After reinstalling some of thoses key packages I could login again just has before.

So if it happens to you, try reinstalling every KDE key package that were altered by any previous uninstall / upgrade operation.

F. NASS

[Frédéric Nass (nass)]

You can get a list of thoses packages by looking at the apt log files in /var/log/apt directory.