[Bug 1877222] [NEW] Casper-rw Persistence files not working with 20.04

[C.S.Cameron]

Public bug reported:

I have just noticed that casper-rw persistent files are not working with
Ubuntu 20.04 when booted from an ISO file.

Persistent partitions are working, however persistent partitions do not
work with "persistent-path" and only one persistent partition is allowed
per USB disk.

This means that a multiboot, multipersistence USB drive is no longer
possible using ISO files.

Hopefully someone will point out that I am making an error somewhere.

I have also just tested BIOS boot of a Persistent UNetbootin USB drive
and there is no persistence.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1877222

Title:
  Casper-rw Persistence files not working with 20.04

Status in grub2 package in Ubuntu:
  New

Bug description:
  I have just noticed that casper-rw persistent files are not working
  with Ubuntu 20.04 when booted from an ISO file.

  Persistent partitions are working, however persistent partitions do
  not work with "persistent-path" and only one persistent partition is
  allowed per USB disk.

  This means that a multiboot, multipersistence USB drive is no longer
  possible using ISO files.

  Hopefully someone will point out that I am making an error somewhere.

  I have also just tested BIOS boot of a Persistent UNetbootin USB drive
  and there is no persistence.

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