Can you please teach me to upgrade Fedora 30 Workstation KDE of Fedora from Spins to Fedora 31 on the Terminal?
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Please, post your repos:
sudo dnf repolist
It looks like you have only official default repos, so you can use the general upgrade method:
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I am using Fedora 30 Workstation KDE of Fedora from Spins. Do I have to do clean installation ?
No, follow the link @vgaetera gave you, and that’s all 
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