Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I just installed Ubuntu Server again. I've done that quite a few times before.

I try starting the system and get to the point where it changes the font on the screen. A little while after that the monitor flickers and I just get a black screen. After that it flickers some more and doesn't respond to anything.

The weird thing comes when I boot into recovery mode. If I select resume boot (without even doing anything else) it resumes boot and finishes booting, giving me a shell. It definitely isn't just a graphics problem either since SSH won't respond (after resume boot it will let me in).

I put the syslog and the output of dmesg here. I can't distinguish between the failed startups and the successful ones.

share|improve this question
up vote 1 down vote accepted

I got the answer in chat.

I had to add nomodeset as a boot parameter to the kernel which made it work. I still get a fail on loading backup graphics device, but since i'll be using the server mostly via ssh that's not a problem.

(In short, it's likely the graphics driver fails in some way. I'm using an NVidia GT 620, which might be too new.)

share|improve this answer
again thanks to Eliah Kagan for the response. I had the exact same problem with another server as well, without the hardware being as new and the graphics driver failing to load (onboard graphics on a 5 year old board). It kept giving stack traces shortly after showing the login prompt. Was also fixed by adding nomodeset. – xyious Aug 10 '12 at 7:20

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.