I have been following this thread since having the problem describe.
System is new Dell D420 with Lucid A2, with updates checked and installed for 
many times each day.
System is set for auto login.

As Steve Langasek wrote at post #61, where he describes the various ways in 
which the problem may be seen,
I have noticed my system pretty well doing those things, that is;

Approximately 60% of the time boot up will be such that I see the ubuntu
logo only for a short period and then the X cursor, with no spinning
wheel. When the boot up goes this way I know I have the freeze state
just waiting for me to hit the enter key at any opportunity. Also I
notice that gdm gets a frame buffer error and blacks the screen, needing
me to go to ctrl F1 and then back to ctrl F7 to have it up again. The
system is still working underneath ok.

When the system boots such that I see the ubuntu logo stay, I then get
to see the spinning wheel in the middle of the logo and then the cursor,
and I know all is well.

I have rebooted many many times to see how consistent this would be, and
well like I say, about 40% clean boots against 60% bad boots.

Yes, plymouth, when installed slows down the boot process considerably. 
Without, it does what others have noticed, in that it generates errors because 
it is not installed to be run.
But without plymouth at this stage the system seems to boot and be stable.

In any case I don't get to see any blue and white bars at any time

the plymouth-splash.conf was already part of the newer updates I installed and 
no improvement.
It looks to be some sort of race situation for it to be so unpredictable I 
think.

So, all this with the latest updates as of 12-02-2009 20:00 Australian time 
(10:00 GMT I think)
Video is Intel Mobile 945GM/ Express rev 03.
kernel 2.6.32-13
GNOME 2.29.90

$ cat /proc/fb
0 inteldrmfb
1 VGA16 VGA

$ ps aw | grep X.*vt
1155    tty7    Ss+    1:11 /usr/bin/X :0 -br - verbose - auth 
/var/run/gdm/auth-for-gdm-noogdp/database -nolisten tcp vt7
1885    pts/0  S+      0:00 grep --color=auto X.*vt

Steve, I know not much of Linux but I appreciated your effort and I
think you explain well the problem and are heading on the right track.
Also grateful to others on this bug for their input.

rockwallaby ~ sipping red wine in hope of inspiration later on ;~)

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Pressing <Enter> causes X to freeze
https://bugs.launchpad.net/bugs/516412
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