@ bryan-murray, I looked for file dates in /var/lib/apt/lists/ to confirm your suspicion, and I think you are right. See the attached file.
There was no increase in drive space used after the second night compared to after the first night, so I am convinced that the bug-fix works :-) ** Attachment added: "console-dialogue.txt" https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1619188/+attachment/4755642/+files/console-dialogue.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1619188 Title: Unattended upgrades can break persistent live media To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1619188/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs