** 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

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