Restore missing LVM volume group

This post will show you how I managed to restore my laptop after the grub configuration got corrupted and could not find the LVM root partition.
The grub menu booted into grub-rescue which I could not use to boot the LVM partitions as it was an unrecognised file system. Therefore the only thing to do was boot into a LIVE system. I tried several but ended up using an Arch system as I could potentially chroot into the installed system.

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