Public bug reported:

Binary package hint: acpi-support

Ubuntu Maverick version of acpi-support was replaced with Debian sid by
accident on my machine. Successfully manually removed apci-support acpi-
support-base and acpi-fakekey using dpkg -P --force-all <name> . Now,
trying to revert to Maverick version in apt cache or manually downloaded
from us.archive.ubuntu.com pool results in dpkg hanging:

$sudo dpkg -i --force-all acpi-support_0.137_amd64.deb 
(Reading database ... 192568 files and directories currently installed.)
Preparing to replace acpi-support 0.137 (using acpi-support_0.137_amd64.deb) ...
Unpacking replacement acpi-support ...
Setting up acpi-support (0.137) ...

It will stay hanging on that line all night, dpkg process shows no cpu /
cputime activity in top > 1GB free ram and <.5 loadavg:

9303 root      20   0 77516  57m 1120 S    0  1.6   0:00.48 dpkg


Until I ctrl-c out of it. 

Setting dpkg --debug=72700 it appears to hang on one of two lines with
equal probability:

D000200: conffderef in='/etc/acpi/events/sony-eject' current
working='/etc/acpi/events/sony-eject'

or

D000200: conffderef in='/etc/acpi/sonybright.sh' current
working='/etc/acpi/sonybright.sh'

so I tried to remove acpi-support again:

---------------------------
 $ sudo dpkg -P --force-all acpi-support
(Reading database ... 192556 files and directories currently installed.)
Removing acpi-support ...
Purging configuration files for acpi-support ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
---------------------------------

Which changes the failure step lines to 100% of the time:

---------------------------------------
Configuration file `/etc/init.d/acpi-support', does not exist on system.
Installing new config file as you requested.

------------------------------
/etc/init.d/acpi-support is correctly removed / deleted by dpkg each time -P is 
used...


$ aptitude show dpkg
Package: dpkg                            
Essential: yes
State: installed
Automatically installed: no
Version: 1.15.8.4ubuntu3
Priority: required
Section: admin
Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com>
Uncompressed Size: 6,263k
PreDepends: libbz2-1.0, libc6 (>= 2.11), libselinux1 (>= 1.32), zlib1g (>= 
1:1.1.4), coreutils (>= 5.93-1), xz-utils
Suggests: apt
Breaks: apt (< 0.7.7), aptitude (< 0.4.7-1), dpkg-dev (< 1.14.16), emacs21 (< 
21.4a+1-5.7), emacs21-nox (< 21.4a+1-5.7), emacs22 (<= 22.2-0ubuntu2),
        emacs22-gtk (<= 22.2-0ubuntu2), emacs22-nox (<= 22.2-0ubuntu2), jed (< 
1:0.99.18+dfsg.1-13), jed-extra (<= 2.5.3-2), konqueror (<=
        4:4.2.96-1), libdpkg-perl (< 1.15.8), pinfo (< 0.6.9-3.1), tkinfo (< 
2.8-3.1), xemacs21-support (< 21.4.22-2), xjed (< 1:0.99.18+dfsg.1-13)
Description: Debian package management system
 This package provides the low-level infrastructure for handling the 
installation and removal of Debian software packages. 
 
 For Debian package development tools, install dpkg-dev.
Homepage: http://wiki.debian.org/Teams/Dpkg


I've googled like crazy on this, found other anecdotal reports of this
package failing on upgrade, but no real answers . I have no idea what
else to try / test / debug... any ideas why this .deb is failing.

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

-- 
dpkg fails to install acpi-support 0.137
https://bugs.launchpad.net/bugs/671214
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