Article 54F3G No root file system is defined

No root file system is defined

by
eco_bach
from LinuxQuestions.org on (#54F3G)
Hi
Had some issues upgrading to 20.04 from 18.04 so I am installing from a Live USB key.

Its been over 2 years since I did my original format and install so need a bit of coaching to make sure I am doing things right.
Am getting a popup error(attached) saying that 'no root file system is defined'.
Based on the attached image, what should I do to correct this?
I want to avoid reformatting and losing all my existing data.
Attached Thumbnailsattachment.php?attachmentid=33354&stc=1& latest?d=yIl2AUoC8zA latest?i=tjF8xSayn7Q:qrZD7KguRfU:F7zBnMy latest?i=tjF8xSayn7Q:qrZD7KguRfU:V_sGLiP latest?d=qj6IDK7rITs latest?i=tjF8xSayn7Q:qrZD7KguRfU:gIN9vFwtjF8xSayn7Q
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