@[deleted] ,
Yes, the UDEV drivers look to be installed. I had troubles with the web install method last time, but, in retrospect, perhaps I should have given that another try rather than going the command line route right out of the gate this time around. I suppose my main question at this time is, since flash-all.sh has seemingly done nothing all night, is it safe to kill the shell and restart the process. I don't know what else to do. Thanks very much for your reply.
Jason