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[మంగిపూడి కోదండరామ్ (Mangipudi Kodanda Ram) <1430625@xxxxxxxxxxxxxxxxxx>]

I am on Kubuntu, with a hybrid Intel-NVIDIA card.

I have upgraded recently from 14.04->14.10->15.04, all in immediate
succession. Upgrade process went without a problem and I was able to use
the computer for a few days. Then once this "ACPI PCC probe failed"
message appeared, but the boot process went well. After another day or
two, now this message appears and says "Welcome to emergency mode! After
logging in type "journalctl -xb" to view system logs, ... ... .. .. ...
bal bla blah, asking for root password.

But I could not boot at all. A "systemctl default" choice also does not
allow me to boot. Now the machine is unbootable.

How can I fix it?

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1430625

Title:
  ACPI PCC probe failed.

Status in One Hundred Papercuts:
  Confirmed
Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  systemd message in RED

  dmesg:
  [    1.068627] ACPI PCC probe failed.

  In kernel 4.0-rc3 Not red

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-7-generic 3.19.0-7.7
  ProcVersionSignature: Ubuntu 3.19.0-7.7-generic 3.19.0
  Uname: Linux 3.19.0-7-generic x86_64
  ApportVersion: 2.16.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   caravena   3118 F...m pulseaudio
   /dev/snd/controlC0:  caravena   3118 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Mar 11 01:13:11 2015
  InstallationDate: Installed on 2014-09-25 (167 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.19.0-7-generic root=UUID=0fb75fae-baa3-428b-ace4-498e69ff7fb6 ro rootflags=subvol=@ quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P14AAJ
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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