Starting xen-4.1.1-rc1-pre.gz on Ubuntu 10.04 server 64bits

edward@jaku:~$ sudo /etc/init.d/xend stop
[sudo] password for edward:
xc: error: Could not obtain handle on privileged command interface (2 = No such file or directory): Internal error
Traceback (most recent call last):
  File "/usr/sbin/xend", line 36, in <module>
    from xen.xend.server import SrvDaemon
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/server/SrvDaemon.py", line 26, in <module>
    import relocate
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/server/relocate.py", line 28, in <module>
    from xen.xend import XendDomain
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendDomain.py", line 36, in <module>
    from xen.xend import XendOptions, XendCheckpoint, XendDomainInfo
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/XendCheckpoint.py", line 20, in <module>
    from xen.xend import balloon, sxp, image
  File "/usr/local/lib/python2.6/dist-packages/xen/xend/image.py", line 46, in <module>
    xc = xen.lowlevel.xc.xc()
xen.lowlevel.xc.Error: (1, 'Internal error', 'xc_interface_open failed: No such file or directory')
edward@jaku:~$ sudo /etc/init.d/xend start
xencommons should be started first.
edward@jaku:~$ sudo /etc/init.d/xencommons start
Starting xenstored...
Setting domain 0 name...
Starting xenconsoled...
edward@jaku:~$ sudo /etc/init.d/xend start
There is already a pid file /var/run/dhclient.eth0.pid with pid 1075
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:1e:37:cc:5d:c9
Sending on   LPF/eth0/00:1e:37:cc:5d:c9
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 139.82.16.33 port 67
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:1e:37:cc:5d:c9
Sending on   LPF/eth0/00:1e:37:cc:5d:c9
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPOFFER of 139.82.2.182 from 139.82.2.129
DHCPREQUEST of 139.82.2.182 on eth0 to 255.255.255.255 port 67
DHCPACK of 139.82.2.182 from 139.82.2.129
bound to 139.82.2.182 -- renewal in 4301 seconds.
edward@jaku:~$