[Bug 1721821] [NEW] Lightdm freezes 50 seconds before KDE Plasma starts

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I upgraded my Kubuntu 17.04 to 17.10 four days ago.

My PC is booting fast: ~10 seconds to see the greeter. But when I
connect to my Plasma session, the greeter is staying ~50 seconds at
screen, before Plasma is starting (in ~10 more seconds). There was no
problem before upgrading to Kubuntu 17.10.

I connected to a terminal session just after having entered my password
in the greeter, and I launched the htop command: all I can say is that
there is no cpu eating process. The cpu is nearly idle during these 50
seconds.

Lightdm version : 1.24.0-0ubuntu1

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: lightdm 1.24.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic i686
ApportVersion: 2.20.7-0ubuntu2
Architecture: i386
CurrentDesktop: KDE
Date: Fri Oct  6 18:13:42 2017
InstallationDate: Installed on 2012-07-31 (1893 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
SourcePackage: lightdm
UpgradeStatus: Upgraded to artful on 2017-10-02 (3 days ago)

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug artful i386
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Lightdm freezes 50 seconds before KDE Plasma starts
https://bugs.launchpad.net/bugs/1721821
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