Thanks for your time and hard work. However, I  think my additions to
this bug are now irrelevant.

I have kept my install updated and purged and reinstalled bootchart so
it includes the desktop (KDE) start-up.

I also purged and reinstalled ureadahead.

Now I have: -

Without ureadahead: 1:12.90
During reprofiling: not sure, I had loads of fscks and X crashes going on for 
several boots
With ureadahead: 0:45.45

So, a fair improvement.

I didn't keep any of my Karmic bootcharts but I think it averaged just
under a minute.

But... (the BIG BUT)...

The 10-15 seconds of black nothingness before the Plymouth splash starts
really is a step backwards. Maybe it's just a consequence of using the
proprietary Nvidia driver, but uspash/xsplash started right after GRUB2
and the progress bar appeared to sync with the boot process (visible
evidence of ureadahead's speed boost).

Right now, the 'boot experience' for me at least isn't quite worthy of
such a title.

Sorry to be so negative. I guess this really a moan rather than a
constructive bug report, but isn't there anyway to get the Plymouth
splash to start after the GRUB2 screen fades?

-- 
Boot speed increased from 30s to 50s when ureadahead enabled
https://bugs.launchpad.net/bugs/552165
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