I tested a live only session with Ubuntu 16.04.1 LTS amd64 last night and it did an unattended upgrade, and after that it used 726 MiB of the allocated space for the root file system:
ubuntu@ubuntu:~$ df -h . Filesystem Size Used Avail Use% Mounted on /cow 1.9G 21M 1.9G 2% / ubuntu@ubuntu:~$ df -h . Filesystem Size Used Avail Use% Mounted on /cow 1.9G 726M 1.2G 38% / ubuntu@ubuntu:~$ df -hi . Filesystem Inodes IUsed IFree IUse% Mounted on /cow 480K 37K 443K 8% / ubuntu@ubuntu:~$ uname -a Linux ubuntu 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ubuntu@ubuntu:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial ubuntu@ubuntu:~$ -- 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
