Tested with the 14.04.4 LTS (trusty), and also got a busy box.
807fa1f246b719d28d0b362fd2f31855 *ubuntu-14.04.4-desktop-amd64.iso
Compared the change logs, still haven't looked at the source (programming not my thing). They have this change in common:
casper (1.340.2) trusty; urgency=low
casper (1.363) wily; urgency=low
* scripts/casper: migrate existing persistent disk images to the updated upper/work form. Record the actual format used and ensure we use the existing format and abort if not possible. (LP: #1481117)
I guess my next test is to find the older Ubuntu 14.04.3 iso and test with that, as it doesn't have that change implemented, maybe as far back as 14.04.2
Tested with the 14.04.4 LTS (trusty), and also got a busy box. 28d0b362fd2f318 55 *ubuntu- 14.04.4- desktop- amd64.iso
807fa1f246b719d
Compared the change logs, still haven't looked at the source (programming not my thing). They have this change in common:
casper (1.340.2) trusty; urgency=low
casper (1.363) wily; urgency=low
* scripts/casper: migrate existing persistent disk images to the updated upper/work form. Record the actual format used and ensure we use the existing format and abort if not possible. (LP: #1481117)
https:/ /bugs.launchpad .net/bugs/ 1481117
I guess my next test is to find the older Ubuntu 14.04.3 iso and test with that, as it doesn't have that change implemented, maybe as far back as 14.04.2