When I boot from the USB stick with Ubuntu 15.04 on it, I'm offered with the choice of trying Ubuntu or installing it directly. Neither of those work as in I don't get past the loading screen. Before that, there are some messages with one of the first ones being ACPI PCC probe failed but the internet™ says, it's fine. Also I get reoccurring errors like these (seems to be related to my graphics card):

[   50435508] nouveau E[   PFIFO][0000:03:00.0] SCHED_ERROR [ UNK06  ]

I’m completely lost and don’t know where to start now. Any help is deeply appreciated. How can I install Ubuntu on its own partition?

The Setup

  • Operating system: Windows 8.1 (64-bit) that was pre-installed on an Acer laptop (UEFI)
  • Graphics card: Nvidia GeForce GTX 850M
  • Boot Mode: EFI / Partition style: GPT (Identifying which boot mode the OS uses)
  • Fast Startup and Secure Boot are disabled
  • There is free space on my hard drive which is not yet partitioned
  • Windows 8.1 installation disk in case I need to repair something
  • Bootable USB stick with Ubuntu 15.04 created by Universal USB Installer (MD5 Checksum of the iso file was verified)
  • Ubuntu installation medium on USB stick created with Rufus
  • First, I've seen a lot of problem reports about the tool you used to create the Ubuntu installer. I suspect that it creates images that are unbootable in EFI mode. I'd try something else, like Rufus. Second, it's imperative that you install both OSes in the same mode (BIOS/CSM/legacy vs. EFI/UEFI). To do that, you must know the Windows boot mode. See this page of mine for information on how to do that.
    – Rod Smith
    Oct 19 '15 at 23:03
  • @RodSmith I will try Rufus. Also, I added the information about the boot mode to the question. It's EFI. Oct 20 '15 at 6:46
  • @RodSmith Trying again with a stick being preparred with Rufus did not change the results. I'm still stuck in the loading screen. Oct 20 '15 at 7:14
  • Just saying again, ACPI PCC probe failed isn't even anything and it is pretty common, i even get it.
    – Star OS
    Nov 1 '15 at 14:09

I had the exactly same problem. Disabling Fast Boot AND CSM got me throught the to the installation. Without Fast Boot I got to the loading screen, but then it got stuck. I read this and as far as I understand, CSM allows non-UEFI installations. Since I have Windows 10 already installed and booting fro UEFI and want a dual boot, I tried disabling CSM et voilà, I am installing ubuntu 15.10 on my ASUS N552VX as we speak.

Hope it works for you too.


Even I had the same problem, both "Try Ubuntu before installing" and "Install Ubuntu" were getting stuck at the loading screen.

I fixed it by following these steps :

  1. When the grub screen comes up, highlight "Install Ubuntu" and press e on the keyboard.
  2. A command line opens, in the second line, navigate to the end and type the following after the two hyphens nouveau modeset=0
  3. Hit F10, it reboots and will work normally.

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