Accidentally accepted update, how can I abort before it actually installs?
Ok, here is how I solved the problem:

I followed the first part of the directions here: http://oldwiki.cyanogenmod.org/wiki/Motorola_Droid_2_Global:_Full_Update_Guide  to wipe the flash and install older version of the Motorola software. (specifically, section 2.1.1)  Then I upgraded to the version that I was running before the update started attempting to run.