I did as you suggested and did get the green Linux Mint Debian Screen in place and was able to move the task bar to the bottom, but it still has "applications," "Places," and "system" and no menu button on the far left of this task bar, but a green button which can hide or show "applications," "Places," and "system." On the right side of this bar are the 4 green squares which indicate work windows, but no time, connectivity, or update manager shield. This bar comes and goes as I move the curser below the bar or into it.
Interestingly, as the system is booting up to my log-in box, I get a very brief (< 1 sec) flash of the blue grey Debian window.
And it is on line wirelessly so I can use it, but it is a pain to use with its present screen setup.
So my next problem is how to restore the task bar to show menu, connectivity, volume, update shield, and date and be able to put the Browser (Firefox) icon and my media player on this task bar.
I'm about to the point of backing up my files and re-installing LMDE (mate), but I have to use Unetbootin and boot from an external hard drive since this backup computer is ancient and cannot boot from USB and only has a cd drive, not a dvd/cd drive. Obviously, a "fix" of the present problems would be easier.
As I said, this older computer works and does run LMDE reasonably rapidly. I believe it is 12 or 13 years old as it has a 1.4 GHz Athlon chip, and I have upgraded the RAM from 256 to 1536 mb and the hard drive from an 80Gig to a 320 Gig one over the years. My computer guru keeps asking me about "old Number One" since he built it and is amazed that it is still running. It started life with Windows 98 and is now a dual boot one with Windows XP and LMDE. (160 Gigs of HDD devoted to each. I'm using a Laptop at work and running Windows 7, but like this "Old Number One" around just for fun.
Anyway, I'd appreciate further help in getting the LMDE out of the "Debian Mode" and back to where I started before the latest upgrade.