What means this erros and how fix it

Device: /dev/sda [SAT], 8 Offline uncorrectable sectors
Device: /dev/sda [SAT], 8 Currently unreadable (pending) sectors

It means that your disk has bad sectors. Try running a self-test with smartctl -t long /dev/sda, and view the results once it finishes with smartctl -a /dev/sda.

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Look for a replacement. Soon.