Thank you for the help. I believe the error was because I was trying to
setup partitions on a system disc manually. It did not work. When I
created one Ext 4 partition on the whole disk everything worked OK.
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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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