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I have recovered my files! Whew.

I was actually able to perform #1 from above, just extract the files from the LVM partition in the disk image.
Below I will give the detailed commands used.

To recap why I am here, I had overwritten my partition table with a blank GPT table.
The disk in question ...

Questions:
1. Is there a way to just extract the files from the LVM partition?
2. If I run testdisk from a liveDVD and have it update the GPT table would that make my original system bootable again?
3. Can I update the GPT table on the image file. Save it and then on a spare machine write that ...

I inadvertently overwrote the partition table on an Ubuntu system using LVM residing on, I believe a HW RAID1.
The system is/was running Ubuntu 18.04 LTS Server.

I was trying to add an external 10TB USB disk for local backups but I wrote a GPT partition table to the system disk instead of the USB ...