Public bug reported:

1) lsb_release -rd
Description:    Ubuntu 12.04 LTS
Release:        12.04

2) apt-cache policy xen-utils-4.1
xen-utils-4.1:
  Installed: 4.1.2-2ubuntu2.1
  Candidate: 4.1.2-2ubuntu2.1
  Version table:
 *** 4.1.2-2ubuntu2.1 0
        500 http://security.ubuntu.com/ubuntu/ precise-security/universe amd64 
Packages
        100 /var/lib/dpkg/status
     4.1.2-2ubuntu2 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages

3) I was trying to upgrade the package, so I expected apt-get upgrade to
finish without errors.

4) All went well except for the package xen-utils-4.1, it was left in a halfly 
configured state...
dpkg -l xen-utils-4.1
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                        Version                     Description
+++-===========================-===========================-======================================================================
iF  xen-utils-4.1               4.1.2-2ubuntu2.1            XEN administrative 
tools


I found some additional info in the xen logs:
[2012-06-18 18:39:55 1854] DEBUG (SrvServer:77) SrvServer.cleanup()
[2012-06-18 18:39:55 1854] DEBUG (XMLRPCServer:251) XMLRPCServer.cleanup()
[2012-06-18 18:39:55 1854] DEBUG (XMLRPCServer:251) XMLRPCServer.cleanup()
[2012-06-18 18:39:55 1854] DEBUG (XendDomain:644) cleanup_domains
[2012-06-18 18:39:55 1853] INFO (SrvDaemon:220) Xend exited with status 0.
[2012-06-18 18:40:50 6322] INFO (SrvDaemon:332) Xend Daemon started
[2012-06-18 18:40:50 6322] INFO (SrvDaemon:336) Xend changeset: unavailable.
[2012-06-18 18:40:50 6322] ERROR (SrvDaemon:349) Exception starting xend 
(Looped capability chain: 0000:01:00.0)
Traceback (most recent call last):
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvDaemon.py", line 
341, in run
    servers = SrvServer.create()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvServer.py", line 
258, in create
    root.putChild('xend', SrvRoot())
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvRoot.py", line 
40, in __init__
    self.get(name)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/web/SrvDir.py", line 84, in get
    val = val.getobj()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/web/SrvDir.py", line 52, in 
getobj
    self.obj = klassobj()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvNode.py", line 
30, in __init__
    self.xn = XendNode.instance()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 1181, in 
instance
    inst = XendNode()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 159, in 
__init__
    self._init_PPCIs()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 282, in 
_init_PPCIs
    for pci_dev in PciUtil.get_all_pci_devices():
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 474, in 
get_all_pci_devices
    return map(PciDevice, get_all_pci_dict())
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 699, in 
__init__
    self.get_info_from_sysfs()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 1269, in 
get_info_from_sysfs
    self.find_capability(0x11)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 1236, in 
find_capability
    ('Looped capability chain: %s' % self.name))
PciDeviceParseError: Looped capability chain: 0000:01:00.0
[2012-06-18 18:40:50 6321] INFO (SrvDaemon:220) Xend exited with status 1.
[2012-06-18 18:54:50 7393] INFO (SrvDaemon:332) Xend Daemon started
[2012-06-18 18:54:50 7393] INFO (SrvDaemon:336) Xend changeset: unavailable.
[2012-06-18 18:54:50 7393] ERROR (SrvDaemon:349) Exception starting xend 
(Looped capability chain: 0000:01:00.0)
Traceback (most recent call last):
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvDaemon.py", line 
341, in run
    servers = SrvServer.create()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvServer.py", line 
258, in create
    root.putChild('xend', SrvRoot())
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvRoot.py", line 
40, in __init__
    self.get(name)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/web/SrvDir.py", line 84, in get
    val = val.getobj()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/web/SrvDir.py", line 52, in 
getobj
    self.obj = klassobj()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvNode.py", line 
30, in __init__
    self.xn = XendNode.instance()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 1181, in 
instance
    inst = XendNode()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 159, in 
__init__
    self._init_PPCIs()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 282, in 
_init_PPCIs
    for pci_dev in PciUtil.get_all_pci_devices():
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 474, in 
get_all_pci_devices
    return map(PciDevice, get_all_pci_dict())
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 699, in 
__init__
    self.get_info_from_sysfs()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 1269, in 
get_info_from_sysfs
    self.find_capability(0x11)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 1236, in 
find_capability
    ('Looped capability chain: %s' % self.name))
PciDeviceParseError: Looped capability chain: 0000:01:00.0
[2012-06-18 18:54:50 7392] INFO (SrvDaemon:220) Xend exited with status 1.
[2012-06-18 18:55:28 7521] INFO (SrvDaemon:332) Xend Daemon started
[2012-06-18 18:55:28 7521] INFO (SrvDaemon:336) Xend changeset: unavailable.
[2012-06-18 18:55:28 7521] ERROR (SrvDaemon:349) Exception starting xend 
(Looped capability chain: 0000:01:00.0)
Traceback (most recent call last):
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvDaemon.py", line 
341, in run
    servers = SrvServer.create()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvServer.py", line 
258, in create
    root.putChild('xend', SrvRoot())
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvRoot.py", line 
40, in __init__
    self.get(name)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/web/SrvDir.py", line 84, in get
    val = val.getobj()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/web/SrvDir.py", line 52, in 
getobj
    self.obj = klassobj()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/server/SrvNode.py", line 
30, in __init__
    self.xn = XendNode.instance()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 1181, in 
instance
    inst = XendNode()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 159, in 
__init__
    self._init_PPCIs()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendNode.py", line 282, in 
_init_PPCIs
    for pci_dev in PciUtil.get_all_pci_devices():
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 474, in 
get_all_pci_devices
    return map(PciDevice, get_all_pci_dict())
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 699, in 
__init__
    self.get_info_from_sysfs()
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 1269, in 
get_info_from_sysfs
    self.find_capability(0x11)
  File "/usr/lib/xen-4.1/bin/../lib/python/xen/util/pci.py", line 1236, in 
find_capability
    ('Looped capability chain: %s' % self.name))
PciDeviceParseError: Looped capability chain: 0000:01:00.0
[2012-06-18 18:55:28 7520] INFO (SrvDaemon:220) Xend exited with status 1


Comming to thing about it, it might also be related to xen related packages 
installation which was upgraded in the same upgrade run...
The related packages:
virtinst 0.600.1-1ubuntu3.1
virt-manager 0.9.1-1ubuntu5.1
xen-docs-4.1 4.1.2-2ubuntu2.1
xen-hypervisor-4.1-amd64 4.1.2-2ubuntu2.1
xenstore-utils 4.1.2-2ubuntu2.1

These versions are after th upgrade....

Hope this helps...
Thanks and Regards,
Geert

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: xen-utils-4.1 4.1.2-2ubuntu2.1
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
Uname: Linux 3.2.0-25-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Mon Jun 18 18:40:50 2012
ErrorMessage: subprocess installed post-installation script returned error exit 
status 1
SourcePackage: xen
Title: package xen-utils-4.1 4.1.2-2ubuntu2.1 failed to install/upgrade: 
subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-package precise

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https://bugs.launchpad.net/bugs/1014746

Title:
  package xen-utils-4.1 4.1.2-2ubuntu2.1 failed to upgrade: subprocess
  installed post-installation script returned error exit status 1

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