How to set up software RAID1 on a running LVM system (incl. GRUB2 configuration) (Ubuntu 18.04)

This guide explains how to set up software RAID1 on an already running LVM system (Ubuntu 18.04). The GRUB2 bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one).

I do not issue any guarantee that this will work for you!

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