[conspire] Upgrade Xubuntu 18.04 to 20.04 reboots to black screen

[paulz at ieee.org]

 Roger,
My condolences.  
First, can you still boot Win?  It may require some manual fussing with the boot instructions.  It certainly has gotten more challenging since UEFI. 
My practice is to keep the OS and my data on separate partitions.  I put as little of my own data as possible on C:    I once had a company computer that developed an intermittent with the power supply.  Several times it crashed during start up.  Since windows writes stuff and updates stuff to the disk during start up and shutdown, it managed to totally corrupt C:
With a Linux OS, I also keep /home on its own partition. Then I can totally reinstall the OS and my personal data is untouched.  Just the same I do back up the data first.
Lastly on a dual boot system.  I can mount my NTFS data partition on Linux then photos, etc are available to both systems.
Paul
    On Monday, October 12, 2020, 10:59:33 AM PDT, rogerchrisman at gmail.com <rogerchrisman at gmail.com> wrote:  
 
 Now I’ve done it. Last night I left my dual boot desktop computer to complete upgrading from Xubuntu 18.04 to 20.04. I had recently updated the 18.04. What could go wrong?
Now it is the next morning and the computer is stuck in black screen. No response to Cntr+Alt+F2 or mouse or keystrokes. Power button is illuminated. So pushed that. System appears to power down, power button and hard disk led are dark. Waited a moment. Pushed power button again. Power button lights up, hard disk led active for a bit. Black screen remains black. Rinse repeat a few times. Ponder the error of my ways. 
Had a similar experience once upon a time. Got back to good graces by doing fresh install from installation cd. I’m thinking of downloading a fresh Xubuntu 20.04 install cd on my hopefully functional ancient Acer laptop that has a cd/dvd writer in it and doing a fresh install on the dual boot desktop with that cd. The desktop box is dual boot with Windows 10 that has my various photos and such.  I hope I don’t ride that over the waterfall. Dang I had started a backup of my Windows 10 stuff to an external hard drive recently but I think I may have neglected to give that enough time to completely back up. 
Aha, found my Bionic Beaver Xubuntu 18.04 install dvd. Maybe I can startup with that and get past the black screen problem somehow? Without redoing the upgrade or a fresh install? Any suggestions from those of you who have been there and done that?
I’m a pirate—I dual boot. Arg! I fly a back screen
Roger :) typed with my thumbs!By reading this email you acknowledge that . Z zen jj.     Now text completion is a rafting pole amd a cataract awaits. _______________________________________________
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