Okay.  I learned a lesson here with Unbuntu 10.04.  Do not switch from
the generic kernel to the PAE kernel without removing all headers and
images
related to said generic kernel.  I have 4 Gigs RAM on my laptop and
almost a Gig wasn't being used, so I switched to the PAE kernel.

Recently, I decided to test out the Beta of 10.10 and booted
VirtualBox which started, but wouldn't boot 10.10.  Something was
wrong.  Mucho tiempo atras.... I figured out I needed to reinstall
VirtualBox, so I downloaded and tried to reinstall.  Error messages
something about directories and kernel headers.  It couldn't figure
out which kernel to use.  Because I had played around with Ubuntu
Tweak, I knew there was a tool to remove old kernels.  I didn't
realize Tweak could also remove headers.  But it did and so I removed
the generic headers and the generic kernels which continued to
download when I switched to the PAE kernel.  Turns out that a sudo
apt-get remove virtualbox removed virtualbox.  I installed it again
from the virtualbox repositories, and viola, accordion, pan flute and
guitar; it worked.

So don't switch between types of kernels without removing the other
type.  While the machine may boot either the generic or PAE kernel, at
least one kind of software doesn't like and won't work with both
kernels installed.

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