ok, you're going to hate me for this, I know it.  As if I've not input enough.  
I did do a separate install of karmic,
and I reproduced this state.  I installed a 64 version.

I installed, prepared the kernel for karmic.  Unless I missed it, Ubuntu
didn't provide a xen kernel for karmic.  I provided my own, and it's run
lenny 64, karmic 32, now karmic 64, gentoo 32 and gentoo 64.  It may not
be perfect.  Anyway, having booted into xen.

ide...@karmic64:~$ sudo libvirtd
[sudo] password for idella: 
22:58:12.769: error : qemudWritePidFile:457 : Failed to open pid file 
'/var/run/libvirtd.pid' : File exists
ide...@karmic64:~$ ls /var/run/libvirt
qemu
ide...@karmic64:~$ sudo rm /var/run/libvirtd.pid
ide...@karmic64:~$ sudo libvirtd
libvir: Network Config error : cannot enable 
/proc/sys/net/ipv6/conf/virbr0/disable_ipv6: No such file or directory
23:00:47.610: warning : qemudStartup:521 : Unable to create cgroup for driver: 
No such device or address
Segmentation fault
ide...@karmic64:~$ ls /var/run/libvirt
qemu
ide...@karmic64:~$ uname -a
Linux karmic64 2.6.31-xen-r10-AMD-64 #19 SMP Sun Feb 28 21:28:33 WST 2010 
x86_64 GNU/Linux

More of the same.  Installed virt-manager, try connecting to xen by gui,

Unable to open connection to hypervisor URI 'xen:///':
<class 'libvirt.libvirtError'> unable to connect to 
'/var/run/libvirt/libvirt-sock': No such file or directory

I booted into the freshly installed server kernel, and

ide...@karmic64:~$ sudo libvirtd
[sudo] password for idella: 
Sorry, try again.
[sudo] password for idella: 
22:39:18.849: error : qemudWritePidFile:457 : Failed to open pid file 
'/var/run/libvirtd.pid' : File exists
ide...@karmic64:~$ sudo rm /var/run/libvirtd.pid
ide...@karmic64:~$ sudo libvirtd
22:39:39.118: warning : qemudStartup:521 : Unable to create cgroup for driver: 
No such device or address
22:39:39.204: warning : lxcStartup:1460 : Unable to create cgroup for driver: 
No such device or address
WARNING: Unhandled message: interface=org.freedesktop.DBus.Introspectable, 
path=/, member=Introspect

^X^Z
[1]+  Stopped                 sudo libvirtd
ide...@karmic64:~$ sudo libvirtd
22:40:21.411: error : qemudWritePidFile:457 : Failed to open pid file 
'/var/run/libvirtd.pid' : File exists
ide...@karmic64:~$ ls /var/run/libvirt
libvirt-sock  libvirt-sock-ro  network  qemu
ide...@karmic64:~$ uname -a
Linux karmic64 2.6.31-19-server #56-Ubuntu SMP Thu Jan 28 03:40:48 UTC 2010 
x86_64 GNU/Linux

Those elusive sockets libvirt-sock  libvirt-sock-ro are there, in an
environment absent of xen.

Yes well, I fear this may lead nowhere if you can't reproduce.  What
kernel would you use??

-- 
libvirt0 unable to operate due to missing essential files
https://bugs.launchpad.net/bugs/527875
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