Have the same problem. Got the "Starting version 219" error to "ACPI PCC
probe failed" messages on every boot regardless of driver. My graphics
card is an added on GT630. There is an ATI grphics processor on-board
that I am not using. Could it be that the driver is loading before the
ACPI PCC probe is complete? It really feels like a timing issue on
startup. I did the upgrade and have done several clean installs with no
change. The OS is only functional with the X.Org X server- Nouveau
display driver, but I still get the errors on startup. Any attempt to
use any NVIDIA driver results in a black screen.

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https://bugs.launchpad.net/bugs/1447978

Title:
  After update from 14.10 to 15.04 boot stops at black screen displaying
  "Starting version 219"

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