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I have a brand new laptop:

Lenovo Legion Y540 Memory: 16GB i7 2.6GHz 500GB

I deleted Windows and installed Ubuntu 18.04.3 LTS, which I have on a pen drive.

sudo apt-get update

works fine and when rebooting, Ubuntu starts fine.

However, after running

sudo apt-get upgrade

and rebooting, Ubuntu does not start.

After the Lenovo start screen, the screen freezes with a black screen and a greenish/purplish horizontal line across the top of the screen. At this point, I have to force a shut down by holding the on-off button and reinstall Ubuntu.

I didn't do anything else on the laptop, and I did this quite a few times now, with reliable results.

What should I do?

anvandarnamn
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  • Is there an Nvidia? – Pilot6 Jan 26 '20 at 20:46
  • Does this answer your question? [My computer boots to a black screen, what options do I have to fix it?](https://askubuntu.com/questions/162075/my-computer-boots-to-a-black-screen-what-options-do-i-have-to-fix-it) – Pilot6 Jan 26 '20 at 20:47
  • There are so much info in that link that I struggle to understand what to do. I do apparently have an Nvidia: myname@myname-Legion-Y540-17IRH:~$ lspci | grep VGA 01:00.0 VGA compatible controller: NVIDIA Corporation Device 2191 (rev a1) – anvandarnamn Jan 26 '20 at 21:14
  • So the problem is with Nvidia drivers. You can always boot with a previous kernel too. – Pilot6 Jan 26 '20 at 21:15
  • The instructions I find on installing Nvidia drivers start with updating and upgrading, which I can't do for the reasons listed above. In any case, some sources strongly recommend against it. The instructions I find on booting with a previous kernel (don't know what that means) also don't work. So I'm more confused than before. A link to instructions would be much appreciated! – anvandarnamn Jan 26 '20 at 23:33

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