Even if it works for you with a live seesion, it does not work for me
with a persistent live session using a casper-rw partition. starting
from the Ubuntu 16.04.1 LTS iso file. I don't think mkusb has anything
at all to to with this functionality because it does not touch the
mechanism (unless you tell it to do it, and then it will prevent
unattended upgrades).

mkusb has a work-around feature, and I think all other tools and manual
methods, that create persistent live drives will need some work-around
to avoid this problem. For example, if you create a cloned system with
the Ubuntu Startup Disk Creator, the cloned result will be exactly like
cloning with mkusb. It is possible in such cases to create persistence
by using a casper-rw partition (or file) in another drive. I will test
tonight, if such a system is also vulnerable to this bug.

I plan to start the test from the Ubuntu 16.04.1 LTS desktop amd64 iso
file. I intend to upgrade casper, but no other program package unless
you advice what must also be upgraded for your fix to work.

But don't tell me that I must try with the current daily iso file,
because then I would have to test for a very long period of time for
something to happen. In that case (if you know things have changed to
the better, but don't know which program packages are involved) maybe I
should zsync today's daily iso file and keep it for some weeks before I
start it and let it run for at least 24 hours.

The important thing here is to get something working for the next point
release, 16.04.2 LTS, so I think it should be tested thoroughly.

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https://bugs.launchpad.net/bugs/1619188

Title:
  Unattended upgrades can break persistent live media

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