Public bug reported:

I am not sure at all what package this bug is; I report it against Unity
because I get to see the purple screen...

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)

Expected result:
should boot fine

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.

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)

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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

Title:
  Boot gets stuck at purple "Ubuntu ...." screen forever if running from
  battery

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