These errors can be due to a variety of reasons:
bad memory modules (solution: use memtest86+ to check your memory)
a bad dvd drive (solution: if possible, try using a different cd/dvd drive)
bad data cable (solution: change it for a new one)
bad media (solution: try burning the iso image to a new disc)
a corrupted iso image (solution: run an md5 checksum, and if they don't match, download the iso image again)
用什么介质安装的ubuntu？
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