Hi,
I have installed Xen on Ubuntu 12.04 as per https://help.ubuntu.com/community/Xen instructions and created the volume-group, logical & physical volume.
Changed the /etc/network/interfaces file to do the network configuration and VM config file.
screen-shot 1:
-----------------------
┌──────────────┤ [!] Choose a mirror of the Ubuntu archive ├──────────────┐
│ │
│ Please select an Ubuntu archive mirror. You should use a mirror in │
│ your country or region if you do not know which mirror has the best │
│ Internet connection to you. │
│ │
│ Usually, <your country code>.
archive.ubuntu.com is a good choice. │
│ │
│ Ubuntu archive mirror: │
│ │
│
us.archive.ubuntu.com │
│ │
│ <Go Back> │
│ │
└─────────────────────────────────────────────────────────────────────────┘
screen-shot 2:
----------------------
┌────────────┤ [!!] Choose a mirror of the Ubuntu archive ├─────────────┐
│ │
│ Bad archive mirror │
│ An error has been detected while trying to use the specified Ubuntu │
│ archive mirror. │
│ │
│ Possible reasons for the error are: incorrect mirror specified; │
│ mirror is not available (possibly due to an unreliable network │
│ connection); mirror is broken (for example because an invalid Release │
│ file was found); mirror does not support the correct Ubuntu version. │
│ │
│ Additional details may be available in /var/log/syslog or on virtual │
│ console 4. │
│ │
│ Please check the specified mirror or try a different one. │
│ │
│ <Go Back> <Continue> │
│ │
└───────────────────────────────────────────────────────────────────────┘