Problem on updating to KDE 6.0

[JK]

I have Maverick 10.10 installed in my laptop and everything was running  
fine. Yesterday I have added backports and updated the KDE from 5.5 to  
6.0. All the updates were applied. But on restart it says it could not  
open the theme file. I am in a dilemma. This is being sent using my  
PC/windows. Anybody please suggest how can I login bypassing the theme  
loading as said or using/installing another desktop other than KDE


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