Comment 70 for bug 172937

These errors are often caused by HW issues:
# 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)

This is all described here: https://help.ubuntu.com/community/SquashfsErrors