* Edit /usr/share/nvidia-current/nvidia-current.grub-gfxpayload and comment out the line that blacklists all Nvidia graphics cards
* sudo update-grub-gfxpayload
* sudo update-grub
WARNING: You may experience graphics memory corruption, system crashes, hangs, loss of data, and other unpleasant experiences. If you are not comfortable with the risk, don't change this.
I was able to restore the splash screen:
* Edit /usr/share/ nvidia- current/ nvidia- current. grub-gfxpayload and comment out the line that blacklists all Nvidia graphics cards grub-gfxpayload
* sudo update-
* sudo update-grub
WARNING: You may experience graphics memory corruption, system crashes, hangs, loss of data, and other unpleasant experiences. If you are not comfortable with the risk, don't change this.