[PLUG] System unbootable after Kubuntu 20.04 update and reboot

[Eric Lucas via plug <plug@lists.phillylinux.org>]

Today I ran apt-get dist-upgrade and it upgraded the system including some nvidia drivers.

It requested a reboot and when I rebooted it very quickly came to a black screen with a single underline cursor in the top left corner.

There is no GUI. There are no virtual consoles. Zero response to any inputs.

I booted it with a Kubuntu 21.04 live USB image. That's where I am at this moment.

I'm guessing I'll need to roll back the Nvidia update and/or rebuild something in grub.

I am not familiar with debugging and repairing a linux system at this level. 

Can anyone please point me to a good guide or guides?

Also, there is something for Ubuntu called "Boot Repair" - it's one of the first suggestions on many pages. 

For example see this post: 

https://sourceforge.net/p/boot-repair/home/Home/

Here is the home page: https://askubuntu.com/questions/1243134/black-screen-on-startup-ubuntu-20-04

Here's how they say to get it:

sudo apt-add-repository ppa:yannubuntu/boot-repair  
sudo apt update  
sudo apt install -y boot-repair  
boot-repair

Does anyone have experience with or advice about this? 

It seems too simple and there is no clear author information so I'm suspicious.

Thanks!

Eric Lucas

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