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[teo1978 <teo8976@xxxxxxxxx>]

When this happens, any of these may happen:

A) I force-power-off the computer, try to boot again in the exact same
conditions (not plugging/unplugging AC power nor mouse nor external
screen), and at the next attempt most of the times it boots normally

B) I do the same as A, but retry for six-seven times and it NEVER
completes boot. So, I disconnect the external screen if it was
connected, or connect it if it wasn't, and then at the next attempt it
works. It may be random, but the odds don't seem high.

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https://bugs.launchpad.net/bugs/1483388

Title:
  System randomly won't complete boot

Status in nvidia-graphics-drivers-340 package in Ubuntu:
  Confirmed
Status in xorg package in Ubuntu:
  New

Bug description:
  Since the incomplete/broken "fix" for #1431753 was released, and hence
  NVidia drivers version 340 were installed AND enabled on my machine
  (where previously I had 331 installed and disabled) this has started
  happening:

  About 50-75% of the times (very rough estimation), when I boot, the
  boot gets stuck at the purple screen with the "Ubuntu" word with four
  red dots below.

  Systematically, when this happens, that screen is preceded by a black screen with a lot of errors, of which I attach a picture (yes, I know, it's unreadable, but it's all I can do).
  If anybody tells me in which log files those errors can be found, I will be happy to attach them.

  Normally, that is, when the issue does not happen and the boot is
  succesful, the black screen preceding the purple screen would only
  contain one line with an unrelated error that has to do with USB.

  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.5+14.04.20150603-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-61.100-generic 3.13.11-ckt22
  Uname: Linux 3.13.0-61-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Mon Aug 10 21:15:32 2015
  InstallationDate: Installed on 2013-10-11 (668 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-05-24 (443 days ago)

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