@Remten: unfortunately, we only modify the main lightdm configuration file. If you install other Ubuntu flavours after installing nvidia- prime, it might not work.
You can try the following steps: 1) Remove the xubuntu settings package (also pay attention to the other packages that this removes): sudo apt-get --purge remove xubuntu-default-settings 2) Reinstall xubuntu-default-settings: sudo apt-get install xubuntu-default-settings 3) Reinstall any packages that were removed when you uninstalled xubuntu-default-settings 4) Make sure that the alternative is set to Xubuntu: sudo update-alternatives --config lightdm-gtk-greeter-config-derivative (and select the alternative for Xubuntu) 5) Finally reinstall nvidia-prime: sudo apt-get install --reinstall nvidia-prime -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1224098 Title: xserver wont start after nvidia-prime installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1224098/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs