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No, only added launchpad.net ubuntu repository, but did not remove repository kali

himself to blame, maybe it did: (user of the blog)

Code:
gksu gedit /etc/lsb-release
Then it will open...

Same 3.12 is working, 3.14 do not run X

After the command

sudo apt-get dist-upgrade

My kali linux became ubuntu
3.12 kernel works fine but does not install the kernel 3.14 run X only black screen, maybe a problem with the drivers...