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I originally guessed this is an xorg bug. Now I suspect it's a hardware
autodetection bug, or something more serious in the reinstall routine
when you don't format the target partition.

It seems major to me and so I'm really surprised I can't find reports of
it against my hardware signature, so could be something distinctive
about my system (strongest candidates : I have an updated BIOS, and was
installing without reformatting the root partition).

On Friday I upgraded from Karmic (working pretty well) to Lucid (was
hogging CPU somehow) on a Lenovo Thinkpad T400.

Because the system was so starved of resources for some reason, I
thought I'd run a fuller rebuild without preserving any of my Karmic
system. It's fairly understandable that the upgrade failed since I tweak
my build a fair bit. I moved /home into /oldhome, and ran an install off
the Lucid livecd without formatting /

I understood this should replace all my system files and give me a clean
home folder to recover my files into.

The sequence I experienced was...

LiveCD booted and ran fine, with good video resolution.
Installer completes but on boot reports it can't load modules.dep
Normal boot causes screen to flash active and inactive (but still black) several times, followed by thin red lines at the top and culminating with large white broken bars filling the lower eighth of the screen. After this I get nothing, no Xorg and no Gnome.

Changing boot options to vga=771 noapic noacpi doesn't help get a usable
system - same result.

CTRL+Alt+F1 drops me back to a console, but after login warns me that it
couldn't handle the home folder decryption (I don't know if this is
connected) and indeed /home/cefn contains just a README about ecryptfs.

My lingering suspicion is that even though I did a clean rebuild,
there's something about the rebuild process which isn't REALLY clean,
unless you format the drive and trash all the data on it.

I wanted to keep the home folder intact on the partition as a backup
renamed to /oldhome. I have a copy of the important information from it,
but I suppose my only option now is to create a second backup and trash
the partition properly, though why this would make any difference I
don't know.

I speculate that some routine fails spectacularly and invisibly during
the install and causes many other critical things not to take place
(e.g. login doesn't decrypt my home folder).

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
Uname: Linux 2.6.34-020634-generic i686
NonfreeKernelModules: ahci e1000e
Architecture: i386
Date: Sun Aug  8 11:13:00 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.34-020634-generic

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug freeze i386 lucid
-- 
ThinkpadT400 Lucid fresh install refuses to boot to Gnome
https://bugs.edge.launchpad.net/bugs/614963
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