[Bug 1065678] [NEW] apt-build fails to install if `grep processors /proc/cpuinfo` don't find anything

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You have been subscribed to a public bug by Scott Kitterman (kitterman):

I was trying to install the apt-build today. After being shown a ncurses
dialog to choose whether to add apt-build repository and then an
optimization level, the dialog was closed and an error shown:

Setting up apt-build (0.12.43) ...
dpkg: error processing apt-build (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 apt-build

I tried to narrow the problem down by repeatedly editing the apt-
build.postinst file, removing code parts and running "dpkg --reconfigure
-a". It turnes out that it's enough to just leave the .postinst as
following to trigger the bug:

#!/bin/sh 
if [ "$1" = "configure" ] ; then
        . /usr/share/debconf/confmodule
fi

Even though I do not know perl almost at all, I tried to read the code in and try to find the real culprit, however whole debconf and thinking behind it is way too complicated for me to get the glimpse fast enough, hence my not-so-much-detailed bug report. 
I will be happy, though, to get instructed by someone else and do some more investigation on the matter.

PS. Please note that I do not have my /tmp mounted with noexec, as this
I believe is the most common cause for this kind of errors with debconf.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: apt-build 0.12.43
Uname: Linux 3.0.42+ armv7l
ApportVersion: 2.6.1-0ubuntu3
Architecture: armhf
Date: Thu Oct 11 21:18:49 2012
SourcePackage: apt-build
UpgradeStatus: Upgraded to quantal on 2012-09-29 (12 days ago)
--- 
Architecture: armhf
DistroRelease: Ubuntu 12.10
Package: debconf 1.5.46ubuntu1
PackageArchitecture: all
Uname: Linux 3.0.42+ armv7l
UserGroups:

** Affects: apt-build (Ubuntu)
     Importance: Undecided
     Assignee: Dominique Lasserre (lasall)
         Status: In Progress


** Tags: apport-bug apport-collected armhf quantal
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apt-build fails to install if `grep processors /proc/cpuinfo` don't find anything
https://bugs.launchpad.net/bugs/1065678
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