With nvidia-173 Xorg fails to start

During Mythbuntu (Lucid beta1) install, if the proprietary
nvidia driver is selected, after reboot system boots to
a text login screen (X fails to start).

If instead OpenSource driver is selected during install,
system reboots to a working Xorg. If nvidia-current
(recommended) is enabled from jockey, after reboot X
fails to start.

ProblemType: Bug
Architecture: i386
Date: Tue Mar 23 00:44:59 2010
DistroRelease: Ubuntu 10.04
DkmsStatus: nvidia-173, 173.14.22, 2.6.32-16-generic, i686: installed
InstallationMedia: Mythbuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
Lsusb:
 Bus 002 Device 002: ID 046d:c521 Logitech, Inc. MX620 Laser Cordless Mouse
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: System manufacturer System Product Name
NonfreeKernelModules: nvidia
Package: nvidia-current (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-16-generic root=UUID=431d13c2-5a9f-442c-b2ff-b0e715435b60 ro quiet splash
ProcEnviron:
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SourcePackage: nvidia-graphics-drivers
Uname: Linux 2.6.32-16-generic i686
dmi.bios.date: 10/17/2006
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS M2NPV-VM ACPI BIOS Revision 0504
dmi.board.name: M2NPV-VM
dmi.board.vendor: ASUSTek Computer INC.
dmi.board.version: 1.xx
dmi.chassis.asset.tag: 123456789000
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSM2NPV-VMACPIBIOSRevision0504:bd10/17/2006:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTekComputerINC.:rnM2NPV-VM:rvr1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-16-generic