This bug still affects 14.04. Upgrading libvirt to 1.2.2-0ubuntu13.1.19
does not fix it.

$ dpkg -l | grep libvirt
ii  libvirt-bin                         1.2.2-0ubuntu13.1.19                  
amd64        programs for the libvirt library
ii  libvirt0                            1.2.2-0ubuntu13.1.19                  
amd64        library for interfacing with different virtualization systems

$ lsb_release -rd
Description:    Ubuntu 14.04.4 LTS
Release:        14.04

$ apt-cache policy libvirt-bin
libvirt-bin:
  Installed: 1.2.2-0ubuntu13.1.19
  Candidate: 1.2.2-0ubuntu13.1.19
  Version table:
 *** 1.2.2-0ubuntu13.1.19 0
        500 http://gh.archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 
Packages
        100 /var/lib/dpkg/status
     1.2.2-0ubuntu13.1.17 0
        500 http://gh.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
     1.2.2-0ubuntu13.1.16 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
     1.2.2-0ubuntu13 0
        500 http://gh.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

Full error message:

Unable to complete install: 'internal error: process exited while connecting to 
monitor: qemu-system-x86_64: -chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/centos7.0.org.qemu.guest_agent.0,server,nowait:
 Failed to bind socket: No such file or directory
qemu-system-x86_64: -chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/centos7.0.org.qemu.guest_agent.0,server,nowait:
 chardev: opening backend "socket" failed
'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 90, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/create.py", line 2277, in 
_do_async_install
    guest.start_install(meter=meter)
  File "/usr/share/virt-manager/virtinst/guest.py", line 501, in start_install
    noboot)
  File "/usr/share/virt-manager/virtinst/guest.py", line 416, in _create_guest
    dom = self.conn.createLinux(start_xml or final_xml, 0)
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3606, in createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed', 
conn=self)
libvirtError: internal error: process exited while connecting to monitor: 
qemu-system-x86_64: -chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/centos7.0.org.qemu.guest_agent.0,server,nowait:
 Failed to bind socket: No such file or directory
qemu-system-x86_64: -chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/centos7.0.org.qemu.guest_agent.0,server,nowait:
 chardev: opening backend "socket" failed

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https://bugs.launchpad.net/bugs/1393842

Title:
  libvirt does not grant qemu-guest-agent channel perms

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