Your installation medium is corrupt; you will need to recreate it and
may want to verify it using the check disc option at the boot menu.
** Changed in: ubiquity (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1715022
Title:
This is often due to a faulty CD/DVD disk or drive, or a faulty hard
disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower
speed, to clean the CD/DVD drive lens (cleaning kits are often
available from electronics suppliers), to check whether the hard disk
is old and in need of replacement, or to move the system to a cooler
environment.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1715022/+subscriptions
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