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I tried to install Ubuntu 12.10 and Ubuntu 13.04 using Flash drive and DVD, but all times I get this error. What does it say? And how can I fix it?

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Take a look at this answer. –  karel May 30 '13 at 7:41
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Try booting again from CD, but this time press any key when the small logo appears at the bottom of your screen, to gain access to the advanced menu screen. Once you get to it, do Check disk for defect, and Test memory. That will tell you if there are any problems with hadware.

enter image description here

Also try verifying the ISO file, by running an MD5SUM on it, and try burning another CD/DVD at slower speed.

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Thank you, I checked for defects but no errors found. But this is screenshot from test memory: imgur.com/s5wS7rd.jpg what is is? And md5 is checked and is same and correct. –  Alireza May 30 '13 at 12:45
    
It looks like you have bad RAM. How many memory modules do you have? –  Mitch May 30 '13 at 12:50
    
I have laptop not pc, it does not have memory module, but it has 4 GB ram. Is this you mean? –  Alireza May 30 '13 at 14:00
    
Yes, that's exactly what I mean. It may have a memory module, or two. –  Mitch May 30 '13 at 16:29
    
Yes, You're right. My hardware has problems. I decided to change them. Thank you dear Mitch. –  Alireza May 30 '13 at 19:41
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