Thank you for all your help. After I booted up Kubuntu last night (this was the second boot since my last post of the sudo error), Adept ran without complaining about another instance and it fetched and installed updates without any errors. However, when I tried to run Full Upgrade it failed. After a couple more reboots I tried just upgrading a handful of files and it also failed. After a dozen or so reboots, system crashes, failed reboots, and more errors, I'm left with a blue screen, a mouse pointer, and nothing else. At this point I have given up. Again, thank you for taking the time to help me.