Public bug reported:

When booting an ISO image from GRUB, the scripts in initrd.lz probe
partitions for the file given by the iso-scan/filename= kernel option.
However a whitelist in the initrd file /scripts/lupin-helpers only
considers partitions with filesystems of the types ext2, ext3, ext4,
xfs, jfs, reiserfs, vfat, ntfs, and iso9660, and will therefore fail to
mount an ISO located on a btrfs partition.  Adding btrfs to this list
worked fine for me when testing with a 15.04 iso.  I'm guessing its
exclusion is just an historic artifact.

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

** Patch added: "patch for contents of /casper/initrd.lz"
   
https://bugs.launchpad.net/bugs/1479760/+attachment/4436171/+files/initrd.patch

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https://bugs.launchpad.net/bugs/1479760

Title:
  iso-scan/filename= does not search btrfs partitions

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