Sebastian Nohn, https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1054927/comments/7 claims unattended-upgrades has been fixed in Xenial (that contains version 0.90). I understand it so that extra kernels should be automatically removed in Xenial. If that is not the case and /boot gets filled up, please update the bug status of bug 1054927.
Sebastian Nohn, https:/ /bugs.launchpad .net/ubuntu/ +source/ update- manager/ +bug/1054927/ comments/ 7 claims unattended-upgrades has been fixed in Xenial (that contains version 0.90). I understand it so that extra kernels should be automatically removed in Xenial. If that is not the case and /boot gets filled up, please update the bug status of bug 1054927.