[Bug 1373792] [NEW] Can't log in with one user, other user log in fine - "Could not start ksmserver, check your installation"

[C K]

Public bug reported:

Hi,
I've upgraded some packages 2 days ago, mainly dbus related I think, and suddenly I cannot log into my KDE desktop anymore.
When logging in I can see the message "Could not start d-bus. Can you call qdbus?". 
So after Googling I found the Solution to that bug "https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1304805" 

I did what comment #12 says:  qdbus=QT_SELECT=qt4 qdbus

However I still cannot log in, now I get the following error for my
user , also an XWindow :

"Could not start ksmserver, check your installation"

On my system I have two users, my main one: CkDev, and another one
corck. When I log in as ckDev I get the following errors above, however
when I log in with my user "corck" everything works fine. I've even
created a new user "guest" and logged in with it and it works fine as
well.

So next step I took, I removed ~/.kde and ~/.config and tried to log in,
same error.

On another thread I read about killing "lightdm" and logging in using
startx, so I switched to terminal mode, and stopped lightdm and executed
"startx". Then my user ckDev is logging in straight away and I have my
Desktop again, with some bugs like my webcam is not working anymore.

So I don't really know whats happening, but after I can log in with
"corck" and "guest" I feels like these users are not using
/usr/bin/startkde but another script, otherwise the Bug #1304805 should
have affected them as well.

I'm on Kubuntu Trusty.

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Can't log in with one user, other user log in fine  - "Could not start
  ksmserver, check your installation"

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