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Since a number of days, a Ubuntu 20.04 machine won't boot. Its internal drive has 3 partitions, and the boot problem seems to come from partition 1 and/or 2:

  1. /dev/nvme0n1p1, EFI system partition, fat32, 512 Mb
  2. /dev/nvme0n1p2, unlocked ext4 partition, 732 Mb
  3. /dev/nvme0n1p3, encrypted LUKS/LVM partition, 475 Gb

I described the boot problem in another question, but now I would like to try a very different method:

  1. From an external Ubuntu 20.04 drive (“Try Ubuntu”), backup and archive the whole /dev/nvme0n1p3 encrypted LUKS/LVM partition on another external drive, for instance as an .iso or similar giant file. (What best method or tool to use? GParted? CloneZilla? A command in Terminal? Another thing?)
  2. Totally reinstall a brand new Ubuntu 20.04 in the internal drive with 3 similar partitions, in order to resolve the boot problem.
  3. Boot into the new Ubuntu 20.04 (internal drive) to verify that everything is OK, especially the partition /dev/nvme0n1p3 (LUKS/LVM, but no personal data in it).
  4. Reboot from the external Ubuntu drive (“Try Ubuntu”) and replace the “new” /dev/nvme0n1p3 internal partition with the “old” /dev/nvme0n1p3 backup — i.e. fully restore the original LUKS/LVM partition.

Is it possible? Or is it just a ridiculous dream? If it is possible, what is the best way to do it?

(As I said, I have already tried this but it was a failure for me.)

JYF
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