What to do if Linux does not start after the update?

Question

linux

Hello, in the morning I launched the update through sudo apt upgrade, during the installation I opened a full-screen window, where there were many lines with systemd journal failed .... I rebooted the laptop and after that only the bios is loaded. Help please
Laptop: Samsung
OS: Ubuntu 20.04

Answer 1

You called me, I saw your question.
I can only laugh, because I will kill a few hours for sure to solve the problem.
Oh okay, is there a working device at hand? You need to create a Live flash drive.

Answer 2

Is that the bios? Or does it output something to the console? Grub There and stuff?
The first thing you need to do is put the download in verbose mode.
https://askubuntu.com/questions/39057/how-do-i-ena... Stupidly
press ESC.
See where the error is. Usually falls after it.
And yes, it's good practice to publish the OS version and logs, at least made from a mobile phone.

Answer 3

Don't do anything already. If you had a btrfs file system and made a snapshot before the update, you could roll back to it, and so, only reinstallation remains.

Answer 4

I had a similar situation, here is the Ubuntu 20.04 link not loading?
I upgraded from version 19 to version 20. The same all flew off, nothing helped.
But I made a live USB flash drive from the second laptop, installed 19.04 next to it and that's it. Now everything works. Only at the start I choose which Linux I need and that's it (and this can be corrected), but it doesn't bother me much.
And I can work on both 19 and 20 ubunt`e.