Comment 19 for bug 982430

This may be an issue with AMD cpus, I've seen a similar problem with eglibc: bug 956051
I can confirm that using the Ubuntu 12.04 LTS 64bit minimal CD to do a net install, it gets past the initial cdrom problem, but then comes up with the dpkg error:
Warning: Failure trying to run: chroot /target dpkg --force-depends --install /var/cache/apt/archives/debconf_1.5.42ubuntu1_all.deb

In the log console while the installer is running (ctrl-alt-f4) I see the following (which leads me to believe it's the above bug):

kernel: [ 2051.425647] pycompile[20389] trap invalid opcode ip:7f84167cae11 sp:7fffc8ca98e0 error:0 in libm-2.15.so[7f8416788000+f9000]
deboostrap: Illegal instruction
debootstrap: dpkg: error processing debconf (--install):

Using: XenServer 6.0.201
server: 2xAMD 12 core 6238 cpus