Re: [PLUG] System unbootable after Kubuntu 20.04 update and reboot

I had had issues with 20.04 LTS on my laptops so I'm holding my main system at 18.04 and waiting for 22.04. In the meantime, I took the 20.04 systems to 20.10 and I have been fine there. My issues... in once case it was the hardware was too new (December 2020 AMD processor and graphics) and in the other, the hardware was from 2016 with Intel graphics. In both cases, 20.04 was initially booting into a black screen and unresponsive (no terminal consoles) like what you are reporting.

The one thing that has saved me while dealing with the 20.04 issue was to choose one of the recovery boot options. I was able to use the system (there's even a way to make that choice the default in grub) and work the problem until I gave up and upgraded to 20.10.

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Keith C. Perry, MS E.E.

Managing Member, DAO Technologies LLC

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From: "Eric Lucas via plug" <plug@lists.phillylinux.org>
To: "Philadelphia Linux User's Group Discussion List" <plug@lists.phillylinux.org>
Sent: Thursday, June 3, 2021 5:19:53 PM
Subject: [PLUG] System unbootable after Kubuntu 20.04 update and reboot

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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