Public bug reported:

Binary package hint: acpi

Steps to reproduce:
1 - Make sure laptop/netbook is connected to power
2 - Boot Ubuntu
3 - Connect to a network using network cable
4 - Unplug network cable (physically disconnect from laptop/netbook)
5 - Unplug power cable

Result:
Ubuntu crashes/hangs/freezes.
Laptop needs to be shut down by force.

Notes:
- This crash only happens if at some point a network cable is connected to the 
computer.
- It's possible to have either the network cable or the power cable unplugged 
(also alternatively) various times without issue, but if at some point both are 
disconnected Ubuntu crashes.
- This issue has been reported previously for previous versions of Ubuntu, I 
was however unable to retrieve any original bug report. If I remember correctly 
the bug report was closed because starting from 9,04 (I think) the issue 
disappeared miraculously. However it's now back (I believe since 10.04)
- Tested on HP Mini 1020LA

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: acpi (not installed)
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Wed Dec 29 14:16:20 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: acpi

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


** Tags: apport-bug i386 maverick

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https://bugs.launchpad.net/bugs/695375

Title:
  ubuntu crashes when unplugging power cable after unplugging network cable

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