I also had this behaviour on 12.10 (upgraded from 12.04)

virt-install was repeatedly not working 
sudo  virt-install --name=lin01 --ram 1024 --disk 
path=/var/lib/libvirt/images/disk1.img,format=raw,bus=virtio,cache=none,size=2 
--disk 
path=/var/lib/libvirt/images/disk2.img,format=raw,bus=virtio,cache=none,size=1  
--network network=default,model=virtio --nographics --accelerate 
--os-type=linux --os-variant=debiansqueeze -x 'DEBIAN_FRONTEND=text 
console=ttyS0,115200n8' 
--location=http://ftp.debian.org/debian/dists/squeeze/main/installer-amd64/

same errors as above

I took @jdstrand's suggestion from  
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/632696/comments/19
and came up with the following (I am new to apparmor so I do not know all 
implications of this change)

--- libvirt-qemu        2013-02-10 00:00:04.909238467 +0100
+++ /etc/apparmor.d/abstractions/libvirt-qemu   2013-02-09 23:41:53.241265822 
+0100
@@ -126,3 +126,17 @@
 
   # for rbd
   /etc/ceph/ceph.conf r,
+
+
+  owner @{PROC}/[0-9]*/fd/ r,
+  owner @{PROC}/[0-9]*/fd/3 r,
+  /usr/lib/pt_chown rCx -> libvirt_pt_chown,
+
+  profile libvirt_pt_chown {
+    #include <abstractions/base>
+    #include <abstractions/consoles>
+    capability fowner,
+    capability chown,
+    /etc/nsswitch.conf r,
+    /etc/group r,
+  }

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https://bugs.launchpad.net/bugs/632696

Title:
  libvirt won't start a VM with serial or console

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