Public bug reported:

Binary package hint: cups

On upgrading cups hangs at:
"Unpacking replacement cups-ppdc ...
Preparing to replace cups 1.4.4-6ubuntu2.2 (using 
.../cups_1.4.4-6ubuntu2.3_amd64.deb) ..."

the stuck process is 'stop cups', which appears happy to wait forever
(left it half an hour or so). The previous update did the same thing.

sudo kill -9 <offending process> allows the upgrades to continue until we get 
to:
"Installing new version of config file /etc/init/cups.conf ..."
where it gets stuck again.

At this point we have this process tree:
  `- aptitude
           `- /usr/bin/dpkg --status-fd 38 --configure linux-headers-2.6.35-24 
libc-dev-bin linux-libc-dev libc6-dev libc6-i386 li
               `- /usr/bin/perl -w /usr/share/debconf/frontend 
/var/lib/dpkg/info/cups.postinst configure 1.4.4-6ubuntu2.2
                   `- /bin/sh /var/lib/dpkg/info/cups.postinst configure 
1.4.4-6ubuntu2.2
                       `- start cups

systracing this process hows:
"restart_syscall(<... resuming interrupted call ...>"

sudo kill kills the 'start' and lets the rest of the upgrades complete.

manually running start cups also hangs

$ps aux | grep cups
root      1083  0.0  0.0  72128  3832 ?        Ss   15:28   0:00 
/usr/sbin/cupsd -C /etc/cups/cupsd.conf

hope that's useful.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: cups 1.4.4-6ubuntu2.3
ProcVersionSignature: Ubuntu 2.6.35-23.41-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic x86_64
Architecture: amd64
Date: Wed Jan 19 18:56:50 2011
MachineType: LENOVO 7484WUL
Papersize: a4
PpdFiles:
 biot: HP LaserJet 4100 Foomatic/hpijs
 mougins: HP LaserJet 4100 Foomatic/hpijs
 PDF: Generic CUPS-PDF Printer
 cam-fse-ps: HP LaserJet 8150 Series Postscript (recommended)
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-23-generic 
root=/dev/mapper/vg_root-lv_root ro quiet splash
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: cups
dmi.bios.date: 02/01/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 5CKT61AUS
dmi.board.name: LENOVO
dmi.board.vendor: LENOVO
dmi.board.version: NONE
dmi.chassis.asset.tag: �������������������������
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.chassis.version: NONE
dmi.modalias: 
dmi:bvnLENOVO:bvr5CKT61AUS:bd02/01/2010:svnLENOVO:pn7484WUL:pvrThinkCentreM58p:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct3:cvrNONE:
dmi.product.name: 7484WUL
dmi.product.version: ThinkCentre M58p
dmi.sys.vendor: LENOVO

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


** Tags: amd64 apport-bug maverick

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https://bugs.launchpad.net/bugs/705067

Title:
  cups hangs on package upgrade

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