Install the Xen hypervisor tools and kernel:
aptitude -y install xen-hypervisor-amd64
Download the Ubuntu 14.04 / trusty kernels to do a netboot off of, the one with the most recent updates here.
Sample configuration, using a netboot kernel:
kernel = '/etc/xen/kernels/trusty-updates/vmlinuz' ramdisk = '/etc/xen/kernels/trusty-updates/initrd.gz' memory = 4096 vcpus = 4 name = 'ubuntu-xen1' disk = ['phy:/dev/xvg/ubuntu-xen1-root,xvda,rw','phy:/dev/xvg/ubuntu-xen1-swap,xvdb,rw'] vif = ['bridge=br0']
Once the installation is finished, disable the kernel and ramdisk settings, and set the bootloader to pygrub:
bootloader = 'pygrub' # kernel = '/etc/xen/kernels/trusty-updates/vmlinuz' # ramdisk = '/etc/xen/kernels/trusty-updates/initrd.gz'