Article 56R12 No root file system is defined

No root file system is defined

by
John4458
from LinuxQuestions.org on (#56R12)
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.latest?d=yIl2AUoC8zA latest?i=Q3t2ZjMwgTk:NfR7i9vt4y8:F7zBnMy latest?i=Q3t2ZjMwgTk:NfR7i9vt4y8:V_sGLiP latest?d=qj6IDK7rITs latest?i=Q3t2ZjMwgTk:NfR7i9vt4y8:gIN9vFwQ3t2ZjMwgTk
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