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I upgraded from 12.10 to 13.04, and am having graphics bugs. Either the screen is blank with random colored pixels at the top of the screen or I get repeated patterns or colors.

I reinstalled (clean) 12.10, and then upgraded to 13.04 right after install. Same issues.

I did install intel graphics drivers from Intel's driver installation package on my original 12.10 install.

Setup : Intel Pentium G2020 (Ivy Bridge), Biostar H61 ITX motherboard

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Does this look like your problem ? askubuntu.com/questions/286522/… –  NWS Apr 27 '13 at 13:47
    
Yes, that looks very familiar. Have you gotten anywhere with this? –  Ryan J. Apr 28 '13 at 2:57
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Nope, my question is getting downvotes :( –  NWS Apr 29 '13 at 7:58
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1 Answer

It's hard to be sure of what is causing this issue because this can be caused by a lot of things, however I have had something similar to this. Here is how I fixed it.

You are going to need to download Ubuntu 13.04 from the website. Then put it on your favourite installation Medium, whether it is a USB or a DVD. Then go and install it. When the installer is first starting and you see the human icon, hit Enter

Ubiquity Human Icon

Then you will see this screen:

Ubiquity chose Language

Chose your language (I assume English), and Hit Enter. Next, hit F6. In that menu, select nomodeset. Then hit Esc

nomodeset

Now select Install Ubuntu and hit Enter.

Install Ubuntu

You will now go back to your regular installation. What you have done is set that the graphics to not run inside the kernel. I don't know the specifics, but in summary, usually fixes these issues.

Good Luck. Hope it works.

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