Did you do CTRL + ALT + F1? and log in?
Then, sudo systemctl enable sddm.service -f
sudo reboot

you can also try to do:
sudo systemctl disable plymouth.service
sudo apt-get remove plymouth
sudo reboot

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https://bugs.launchpad.net/bugs/1431743

Title:
  Kubuntu 15.04 Beta1 hangs at starting 219 after update

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