the same here, the new version of casper is not working properly:

there is not only problem with assembling root FS as reported above, but
I am also not able to boot with persistent boot cmd:

reproduce:

-syslinuxed vfat  USB stick:  /casper/filesystem.squashfs,initrd.gz,vmlinuz
-persistent keyword on cmdline
-boot ends up in busybox

without "persistent" keyword, system boots ok

CAUSE:

initramfs-tools/scripts/casper: find_cow_device() called from
setup_unionfs("/cdrom/casper","/root"), unmounts previously mounted
/cdrom during scanning for casper-rw; /cdrom/casper/filesystem.squashfs
is then not accessible for mount ...



** Patch added: "dirty fix"
   
https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1520575/+attachment/4588796/+files/casper-persistent-boot.patch

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https://bugs.launchpad.net/bugs/1520575

Title:
  casper-sn persistence fails in 14.04.3, 15.10

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