Convert an existing Linux file system to LVM

Why?

As I frequently reinstall my OS (for various reasons) but in the mean time I still want to be able to access my old OS for daily use, I do a lot resizing of filesystems and partitioning of my hard disk. When the time has come to use the new OS installation as a daily driver, I like to reclaim my old OS space so I can have all the space available.

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