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I have new computer, I had on in two systems, Windows 10 and Ubuntu. Last time I downloaded some elements to SQL management studio from untrusted side and my computer becomes so much slower, and I must wait for system option about 5-10 minutes. I haven't seen anything in task manager. So, I prepared my computer for new installation both systems, I deleted all partitions, created new and install Windows again, everything went good but my computer is still slow. When I want to install Ubuntu I have many lines of this :

blk_update_request: I/O error, dev sr1, sector 262136

My question is, what should I do ? I have no idea.

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    There are read problems from your CD/DVD-rom. Did you try installing from usb? Your windows is installed in UEFI or legacy mode ? – EdiD Dec 7 '16 at 16:31
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It looks like you're installing from a DVD with some unreadable sectors. You need to burn a new bootable DVD and install from that. You can also prepare a bootable USB drive instead of a DVD. Make sure that you verify the integrity of the downloaded file to avoid random errors!

In both case it is recommended to verify the integrity of the installation medium (DVD or USB) which would detect unreadable and unreliable media and anything else that might have corrupted the data of the live system and the installer.

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It cat mean that your cd/dvd is damaged.

You can try to install it from usb flash. You can make it from windows too.

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I changed the SATA mode (in my BIOS ) from IDE to AHCI and the problem solved

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