# Ubuntu 18.04 Lambda Stack Freezes on Boot

## post by icelancer on Aug 26, 2019

I recently gracefully shut down my Threadripper-based server with Ubuntu 18.04 installed and Lambda Stack. I’ve had no problems in the past getting it to boot, but now it freezes at the black Lambda logo screen and does not progress to the standard white background of the desktop.

I have tried this to disable graphics:

[Black screen after boot](https://deeptalk.lambda.ai/t/ubuntu-18-04-shows-a-black-screen-after-boot/485/3)

As well as the RAID suggestions (I have a RAID array labeled md0):

[Lambda quad boot stuck on purple Ubuntu loading screen](https://deeptalk.lambda.ai/t/lambda-quad-boot-stuck-on-purple-ubuntu-loading-screen/304)

But nothing works; both just cause the machine to freeze in the usual spot. I can’t even get it to show me a scrolling console of messages by deleting "quiet splash" from GRUB.

What are the next steps? I’ve been running the server for months and can’t get into it; very frustrating as we use it as a virtual machine host.

## post by japos on Jan 4, 2020

I got exactly the same issue. Tried to update the graphic card driver but does not work.

Any suggestions?

## post by MikeBee on Feb 16, 2020

Try closing and reopening your laptop. On a desktop, put it to sleep and awaken it. It may be an acpi issue.

## post by alexcoca on Mar 4, 2020

Has anyone managed to overcome this issue? Not exactly sure how to send the desktop to sleep as there is no sleep button on my machine…

Any help appreciated!