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[teo1978 <teo8976@xxxxxxxxx>]

** Attachment added: "IMG_20150813_210905185.jpg"
   https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1483388/+attachment/4444371/+files/IMG_20150813_210905185.jpg

** Description changed:

- I am not sure at all what package this bug is; I report it against Unity
- because I get to see the purple screen...
+ 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:
  
- Steps to reproduce:
- - turn on the laptop while not connected to AC power, but with more than enough battery charge (tested with battery completely charged)
+ 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.
  
- Expected result:
- should boot fine
+ 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.
  
- Observed result:
- When the purple Ubuntu loading screen appears and the four dots below the word "Ubuntu" are all filled in red, the system gets stuck at that screen for fucking ever.
- No matter how many times I retry, it will always remain stuck there.
- If I connect the charger and reboot, then it works fine.
+ 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.
  
- This REGRESSION has appeared after some recent automatic updates. This
- didn't use to happen before. I had booted with  battery power thousands
- of time, though it's not something that I do very often so i can't tell
- exactly when the regression appeared.
- 
- 
- Before the purple screen appears, for a fraction of a second I've been able to see a black screen full of messages, probably error messages, while normally (when boot works fine) there would only be one usb-related error message.
- 
- Please let me know from which log I can retrieve those error messages so
- that I can post them here.
- 
- Don't tell me to update the bios, because this used to work on the very
- same machine, so the issue is obviously in Ubuntu.
  
  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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https://bugs.launchpad.net/bugs/1483388

Title:
  System randomly won't complete boot

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

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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