Public bug reported:

A few days ago, while installing automatic updated (in the "background"
while doing other stuff, so I didn't know it was because of the
updates), the whole system froze, that is, stopped responding to mouse,
keyboard and anything. Not even Ctrl+Alt+F1 would work, so the only
thing I could do was a hard power off.

I rebooted and I thought that had been something sporadical, but now I
wanted to install some package, namely yasm, so I did:

$ sudo apt-get install yasm

and the output was:

  E: dpkg was interrupted, you must manually run 'sudo dpkg --configure
-a' to correct the problem.

I ran 'sudo dpkg --configure -a'

There were a few scary lines in the output regarding grub and linux images (as 
if it was reinstalling and/or reconfiguring grub for some reason), including:
  killed
  done
Then after some more lines like "Processing triggers for whatever" it repeated 
the stuff about grub. It got stuck for several minutes after a message that 
read something like "Windows loader found at /what/ever" (got stuck meaning it 
would neither produce any more output nor would it exit to the command line), 
without consuming any significant amount of cpu.

Some minutes later, Chrome would only display blank pages, and while I
was clicking on Google Chrome's window's button to close it, the whole
system stopped responding again, forcing me once more to power it down
the "hardware" way.

I repeated the whole process once more.


So: dpkg is broken, MY WHOLE SYSTEM IS BROKEN and I can't install any packages 
or system updates.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: dpkg 1.17.25ubuntu1.1
ProcVersionSignature: Ubuntu 3.19.0-37.42-generic 3.19.8-ckt9
Uname: Linux 3.19.0-37-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.8
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Dec  5 01:07:08 2015
InstallationDate: Installed on 2013-10-11 (784 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: dpkg
UpgradeStatus: Upgraded to vivid on 2015-08-15 (111 days ago)

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1523002

Title:
  dpkg systematically freezes the whole system, can't install anything

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